diff --git a/app/Console/Commands/NotifyInactiveProjects.php b/app/Console/Commands/NotifyInactiveProjects.php
new file mode 100644
index 00000000..9b414c20
--- /dev/null
+++ b/app/Console/Commands/NotifyInactiveProjects.php
@@ -0,0 +1,133 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\Project;
+use App\Models\User;
+use App\Notifications\ProjectInactivityReminderNotification;
+use App\Notifications\ProjectInactivityReportToAdmins;
+use Carbon\Carbon;
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Notification;
+
+class NotifyInactiveProjects extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'nmrxiv:notify-inactive-projects {--months= : Number of months of inactivity (defaults to config inactivity.grace_months)} {--list : Only list inactive projects without notifying} {--report-admins : Email admins a report of inactive projects}';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'Notify project owners if the project has had no updates for N months (default 6).';
+
+    /**
+     * Execute the console command.
+     */
+    public function handle(): int
+    {
+        $months = (int) ($this->option('months') ?? config('inactivity.grace_months', 6));
+        $threshold = Carbon::now()->subMonths($months);
+
+        return DB::transaction(function () use ($threshold) {
+            // Identify inactive projects and mark them inactive
+            $projects = Project::with('owner', 'users')
+                ->where('is_public', false)
+                ->where('is_deleted', false)
+                ->where('is_archived', false)
+                ->where('updated_at', '<', $threshold)
+                ->get();
+
+            if ($this->option('list')) {
+                $this->table(['ID', 'Name', 'Owner Email', 'Updated At'], $projects->map(function ($p) {
+                    return [$p->id, $p->name, optional($p->owner)->email, (string) $p->updated_at];
+                })->toArray());
+                $this->info('Total inactive projects: '.count($projects));
+
+                return self::SUCCESS;
+            }
+
+            // Mark these projects as inactive in DB (idempotent) without touching updated_at
+            if ($projects->count() > 0) {
+                $ids = $projects->pluck('id');
+                Project::withoutTimestamps(function () use ($ids) {
+                    Project::whereIn('id', $ids)->update(['active' => false]);
+                });
+            }
+
+            // Aggregate by recipient so each user gets a single digest listing all of their inactive projects
+            $recipientProjects = [];
+            foreach ($projects as $project) {
+                foreach ($this->prepareSendList($project) as $recipient) {
+                    $recipientProjects[$recipient->id]['user'] = $recipient;
+                    $recipientProjects[$recipient->id]['projects'][] = $project;
+                }
+            }
+
+            // Send one email per recipient with their list of inactive projects
+            $sentCount = 0;
+            foreach ($recipientProjects as $entry) {
+                /** @var \App\Models\User $user */
+                $user = $entry['user'];
+                $list = collect($entry['projects'])->map(function ($p) {
+                    return [
+                        'id' => $p->id,
+                        'name' => $p->name,
+                        'updated_at' => (string) $p->updated_at,
+                        'url' => url(config('app.url').'/dashboard/projects/'.$p->id),
+                    ];
+                })->values()->all();
+
+                Notification::send($user, new ProjectInactivityReminderNotification($list));
+                $sentCount++;
+            }
+
+            $this->info('Inactive project digests sent: '.$sentCount.' (covering '.count($projects).' projects)');
+
+            if ($this->option('report-admins') && $projects->count() > 0) {
+                $payload = $projects->map(function ($p) {
+                    return [
+                        'id' => $p->id,
+                        'name' => $p->name,
+                        'owner' => optional($p->owner)->email ?? 'N/A',
+                        'updated_at' => (string) $p->updated_at,
+                    ];
+                })->values()->all();
+
+                Notification::send(User::role(['super-admin'])->get(), new ProjectInactivityReportToAdmins($payload));
+                $this->info('Admin report sent to super-admins.');
+            }
+
+            return self::SUCCESS;
+        });
+    }
+
+    /**
+     * Prepare recipients list (owner and creators).
+     */
+    protected function prepareSendList(Project $project): array
+    {
+        $sendTo = [];
+        $add = function ($user) use (&$sendTo) {
+            if ($user && isset($user->id)) {
+                $sendTo[$user->id] = $user;
+            }
+        };
+
+        foreach ($project->allUsers() as $member) {
+            if ($member->projectMembership->role == 'creator' || $member->projectMembership->role == 'owner') {
+                $add($member);
+            }
+        }
+
+        $add($project->owner);
+
+        return array_values($sendTo);
+    }
+}
diff --git a/app/Mail/ProjectInactivityReminder.php b/app/Mail/ProjectInactivityReminder.php
new file mode 100644
index 00000000..81bc84af
--- /dev/null
+++ b/app/Mail/ProjectInactivityReminder.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class ProjectInactivityReminder extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    public $projectOrList;
+
+    /**
+     * Accept either a single Project or an array list for digest emails.
+     */
+    public function __construct($projectOrList)
+    {
+        $this->projectOrList = $projectOrList;
+    }
+
+    /**
+     * Build the message.
+     */
+    public function build()
+    {
+        // Digest mode when an array is passed
+        if (is_array($this->projectOrList)) {
+            return $this->markdown('vendor.mail.project-inactivity-reminder', [
+                'digest' => true,
+                'projects' => $this->projectOrList,
+                'thresholdMonths' => (int) config('inactivity.grace_months', 6),
+            ])->subject(__('Your inactive projects digest'));
+        }
+
+        // Single project mode (backwards compatible)
+        $project = $this->projectOrList;
+
+        return $this->markdown('vendor.mail.project-inactivity-reminder', [
+            'url' => url(config('app.url').'/dashboard/projects/'.$project->id),
+            'projectName' => $project->name,
+            'lastUpdated' => explode(' ', \Illuminate\Support\Carbon::parse($project->updated_at))[0],
+            'digest' => false,
+        ])->subject(__('Your project has been inactive'.' - '.$project->name));
+    }
+}
diff --git a/app/Mail/ProjectInactivityReportToAdmins.php b/app/Mail/ProjectInactivityReportToAdmins.php
new file mode 100644
index 00000000..9bc2502a
--- /dev/null
+++ b/app/Mail/ProjectInactivityReportToAdmins.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class ProjectInactivityReportToAdmins extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    /** @param array<int, array{id:int,name:string,owner:string,updated_at:string}> $projects */
+    public function __construct(private array $projects)
+    {
+        //
+    }
+
+    public function build(): self
+    {
+        return $this->markdown('vendor.mail.project-inactivity-report-admins', [
+            'projects' => $this->projects,
+            'thresholdMonths' => (int) config('inactivity.grace_months', 6),
+        ])->subject(__('Inactive projects report'));
+    }
+}
diff --git a/app/Models/Project.php b/app/Models/Project.php
index 8cad91ce..dba8ff0a 100644
--- a/app/Models/Project.php
+++ b/app/Models/Project.php
@@ -7,6 +7,7 @@
 use App\Events\ProjectDeletion;
 use App\Notifications\ProjectDeletionFailureNotification;
 use App\Notifications\ProjectDeletionReminderNotification;
+use App\Notifications\ProjectInactivityReminderNotification;
 use App\Traits\CacheClear;
 use Auth;
 use Carbon\Carbon;
@@ -42,6 +43,7 @@ class Project extends Model implements Auditable
         'starred',
         'location',
         'is_public',
+        'active',
         'obfuscationcode',
         'description',
         'type',
@@ -59,6 +61,16 @@ class Project extends Model implements Auditable
         'species',
     ];
 
+    /**
+     * Casts for the model attributes.
+     */
+    protected function casts(): array
+    {
+        return [
+            'active' => 'boolean',
+        ];
+    }
+
     protected static $marks = [
         Like::class,
         Bookmark::class,
@@ -285,6 +297,19 @@ public function validation(): BelongsTo
         return $this->belongsTo(Validation::class, 'validation_id');
     }
 
+    /**
+     * Model boot method to ensure that any meaningful update re-activates the project.
+     */
+    protected static function booted(): void
+    {
+        static::saving(function (Project $project): void {
+            // If something changes other than 'active' itself, mark as active again
+            if ($project->isDirty() && ! $project->isDirty('active')) {
+                $project->active = true;
+            }
+        });
+    }
+
     /**
      * Determine if the model should be searchable.
      *
@@ -354,6 +379,9 @@ public function sendNotification($notifyType, $sendTo)
             case 'publish':
                 event(new DraftProcessed($this, $sendTo));
                 break;
+            case 'inactivityReminder':
+                Notification::send($sendTo, new ProjectInactivityReminderNotification($this));
+                break;
         }
     }
 }
diff --git a/app/Notifications/ProjectInactivityReminderNotification.php b/app/Notifications/ProjectInactivityReminderNotification.php
new file mode 100644
index 00000000..59d2d602
--- /dev/null
+++ b/app/Notifications/ProjectInactivityReminderNotification.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Mail\ProjectInactivityReminder as ProjectInactivityReminderMailable;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Mail\Mailable;
+use Illuminate\Notifications\Notification;
+
+class ProjectInactivityReminderNotification extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    /**
+     * @param  mixed  $payload  Either a Project instance or an array of projects for digest
+     */
+    public function __construct(private $payload)
+    {
+        //
+    }
+
+    /**
+     * Get the notification's delivery channels.
+     */
+    public function via($notifiable): array
+    {
+        return ['mail'];
+    }
+
+    /**
+     * Get the mail representation of the notification.
+     */
+    public function toMail($notifiable): Mailable
+    {
+        return (new ProjectInactivityReminderMailable($this->payload))->to($notifiable->email);
+    }
+
+    /**
+     * Get the array representation of the notification.
+     */
+    public function toArray($notifiable): array
+    {
+        return [];
+    }
+}
diff --git a/app/Notifications/ProjectInactivityReportToAdmins.php b/app/Notifications/ProjectInactivityReportToAdmins.php
new file mode 100644
index 00000000..c81e23f8
--- /dev/null
+++ b/app/Notifications/ProjectInactivityReportToAdmins.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Mail\ProjectInactivityReportToAdmins as ProjectInactivityReportToAdminsMailable;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Mail\Mailable;
+use Illuminate\Notifications\Notification;
+
+class ProjectInactivityReportToAdmins extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    /** @param array<int, array{id:int,name:string,owner:string,updated_at:string}> $projects */
+    public function __construct(private array $projects)
+    {
+        //
+    }
+
+    public function via($notifiable): array
+    {
+        return ['mail'];
+    }
+
+    public function toMail($notifiable): Mailable
+    {
+        return (new ProjectInactivityReportToAdminsMailable($this->projects))->to($notifiable->email);
+    }
+
+    public function toArray($notifiable): array
+    {
+        return [];
+    }
+}
diff --git a/config/inactivity.php b/config/inactivity.php
new file mode 100644
index 00000000..bc203426
--- /dev/null
+++ b/config/inactivity.php
@@ -0,0 +1,6 @@
+<?php
+
+return [
+    // Inactivity grace period in months before notifications and potential actions
+    'grace_months' => (int) env('INACTIVITY_GRACE_MONTHS', 6),
+];
diff --git a/database/factories/ProjectFactory.php b/database/factories/ProjectFactory.php
index 6d0ce5ee..74da8bb8 100644
--- a/database/factories/ProjectFactory.php
+++ b/database/factories/ProjectFactory.php
@@ -24,6 +24,7 @@ public function definition(): array
             'is_public' => false,
             'is_deleted' => false,
             'is_archived' => false,
+            'active' => true,
             'status' => 'draft',
             'process_logs' => null,
             'location' => null, // todo: Adjust when location field is provided in nmrXiv
diff --git a/database/migrations/2025_09_25_000001_add_active_column_to_projects_table.php b/database/migrations/2025_09_25_000001_add_active_column_to_projects_table.php
new file mode 100644
index 00000000..45c677ec
--- /dev/null
+++ b/database/migrations/2025_09_25_000001_add_active_column_to_projects_table.php
@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('projects', function (Blueprint $table) {
+            $table->boolean('active')->default(true);
+            $table->index('active');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('projects', function (Blueprint $table) {
+            $table->dropIndex(['active']);
+            $table->dropColumn('active');
+        });
+    }
+};
diff --git a/resources/js/Pages/Project/Index.vue b/resources/js/Pages/Project/Index.vue
index 3b9765b1..d4dfb62c 100644
--- a/resources/js/Pages/Project/Index.vue
+++ b/resources/js/Pages/Project/Index.vue
@@ -174,6 +174,12 @@
                                                 ></StarIcon>
                                             </div>
                                             {{ project.name }}
+                                            <span
+                                                v-if="project.active === false"
+                                                class="ml-4 inline-flex items-center px-3 py-0.5 rounded-full text-sm font-medium bg-gray-200 text-gray-700 uppercase"
+                                            >
+                                                Inactive
+                                            </span>
                                             <span
                                                 v-if="
                                                     project.draft_id != null &&
diff --git a/resources/js/Pages/Project/Show.vue b/resources/js/Pages/Project/Show.vue
index ea34f223..e98d3516 100644
--- a/resources/js/Pages/Project/Show.vue
+++ b/resources/js/Pages/Project/Show.vue
@@ -74,6 +74,12 @@
                                     @click="toogleStarred"
                                 />
                                 {{ project.name }}
+                                <span
+                                    v-if="project.active === false"
+                                    class="ml-3 inline-flex items-center px-3 py-0.5 rounded-full text-sm font-medium bg-gray-200 text-gray-700 uppercase"
+                                >
+                                    Inactive
+                                </span>
                                 <button
                                     v-if="canUpdateProject"
                                     type="button"
diff --git a/resources/markdown/terms.md b/resources/markdown/terms.md
index 686c6494..dfbf107a 100644
--- a/resources/markdown/terms.md
+++ b/resources/markdown/terms.md
@@ -35,3 +35,9 @@ When you contribute scientific data to the nmrXiv database through our website o
 nmrXiv itself places no additional restrictions on the use or redistribution of the data available via its online services other than those provided by the original data owners.
 
 nmrXiv does not guarantee the accuracy of any provided data, generated database, software or online service nor the suitability of data, software and online services for any purpose.
+
+## Inactive Projects
+
+To ensure efficient use of storage and to maintain a high-quality catalogue, nmrXiv may classify projects as inactive when no updates or activity have occurred for an extended period. Currently, the inactivity grace period is six (6) months by default and may be adjusted by the service configuration.
+
+If a project remains inactive beyond the grace period, nmrXiv may notify the project owner(s) and designated collaborators via email. Continued inactivity after notifications may result in additional administrative actions, which can include archival or deletion in accordance with our data retention policies. Owners can prevent these actions by resuming activity or contacting support for assistance within the notification timeframe.
diff --git a/resources/views/vendor/mail/project-inactivity-reminder.blade.php b/resources/views/vendor/mail/project-inactivity-reminder.blade.php
new file mode 100644
index 00000000..2d130c88
--- /dev/null
+++ b/resources/views/vendor/mail/project-inactivity-reminder.blade.php
@@ -0,0 +1,44 @@
+@component('mail::message')
+
+Dear nmrXiv user,
+
+@if(!empty($digest))
+We found the following projects inactive for {{ $thresholdMonths ?? 6 }} month{{ ($thresholdMonths ?? 6) == 1 ? '' : 's' }} or more:
+
+@component('mail::table')
+| ID | Name | Last Updated | Link |
+|:--:|:-----|:-------------|:-----|
+@foreach($projects as $p)
+| {{ $p['id'] }} | {{ $p['name'] }} | {{ $p['updated_at'] }} | [Open]({{ $p['url'] }}) |
+@endforeach
+@endcomponent
+
+@else
+{{ __('Your project - **:project** has had no activity since :lastUpdated.', ['project' => $projectName, 'lastUpdated' => $lastUpdated]) }}
+
+@component('mail::button', ['url' =>  $url, 'color' => 'green'])
+Review Project
+@endcomponent
+@endif
+
+Please review your project(s) and take any necessary action to keep them up to date. You can update metadata, upload new data, or make changes as needed.
+
+@component('mail::panel')
+⚠️ Important: These project(s) are marked as Inactive. If no updates are made within the next {{ $thresholdMonths ?? 6 }} month{{ ($thresholdMonths ?? 6) == 1 ? '' : 's' }}, they will be automatically deleted by our system.
+
+To avoid deletion, you can:
+- Update and publish the project (if it is ready), or
+- Make any update to the project to remove the Inactive tag
+
+If you are no longer working on a project, you can delete it yourself from the Project Settings tab. If no action is taken, the project will be deleted automatically after the period above.
+@endcomponent
+
+Follow our [documentation](https://docs.nmrxiv.org/) to learn more.
+
+If you do not recognize this notification or need help, contact us at {{env('MAIL_FROM_ADDRESS')}}.
+
+Regards,
+
+The nmrXiv Team
+
+@endcomponent
diff --git a/resources/views/vendor/mail/project-inactivity-report-admins.blade.php b/resources/views/vendor/mail/project-inactivity-report-admins.blade.php
new file mode 100644
index 00000000..724c2a65
--- /dev/null
+++ b/resources/views/vendor/mail/project-inactivity-report-admins.blade.php
@@ -0,0 +1,23 @@
+@component('mail::message')
+
+Dear Admin,
+
+Below is the current list of inactive projects which has past inactivity threshold of {{ $thresholdMonths }} month{{ $thresholdMonths == 1 ? '' : 's' }}:
+
+@if(empty($projects))
+No inactive projects at this time.
+@else
+@component('mail::table')
+| ID | Name | Owner | Last Updated |
+|:--:|:-----|:------|:-------------|
+@foreach($projects as $p)
+| {{ $p['id'] }} | {{ $p['name'] }} | {{ $p['owner'] }} | {{ $p['updated_at'] }} |
+@endforeach
+@endcomponent
+@endif
+
+Regards,
+
+The nmrXiv Team
+
+@endcomponent
diff --git a/routes/console.php b/routes/console.php
index 3acbeead..fc5cc967 100644
--- a/routes/console.php
+++ b/routes/console.php
@@ -21,6 +21,7 @@
 // Schedule::command('nmrxiv:publish')->daily();
 Schedule::command('nmrxiv:delete-projects')->daily();
 Schedule::command('nmrxiv:index-molecules')->daily();
+Schedule::command('nmrxiv:notify-inactive-projects --months=6 --report-admins')->monthly();
 Schedule::command('nmrxiv:delete-citations')->weekly();
 Schedule::command('nmrxiv:delete-authors')->weekly();
 if (App::environment('production')) {
diff --git a/tests/Feature/NotifyInactiveProjectsTest.php b/tests/Feature/NotifyInactiveProjectsTest.php
new file mode 100644
index 00000000..119d79d0
--- /dev/null
+++ b/tests/Feature/NotifyInactiveProjectsTest.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Project;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Carbon;
+use Illuminate\Support\Facades\Artisan;
+use Illuminate\Support\Facades\Notification;
+use Tests\TestCase;
+
+class NotifyInactiveProjectsTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_inactivity_email_is_sent_for_old_projects(): void
+    {
+        Notification::fake();
+
+        $owner = User::factory()->create();
+        $project = Project::factory()->create([
+            'owner_id' => $owner->id,
+            'updated_at' => Carbon::now()->subMonths(7),
+            'is_deleted' => false,
+            'is_archived' => false,
+        ]);
+
+        // Run the command
+        Artisan::call('nmrxiv:notify-inactive-projects');
+
+        Notification::assertSentTo(
+            [$owner],
+            \App\Notifications\ProjectInactivityReminderNotification::class
+        );
+    }
+
+    public function test_recent_projects_are_not_notified(): void
+    {
+        Notification::fake();
+
+        $owner = User::factory()->create();
+        $project = Project::factory()->create([
+            'owner_id' => $owner->id,
+            'updated_at' => Carbon::now()->subMonths(2),
+            'is_deleted' => false,
+            'is_archived' => false,
+        ]);
+
+        Artisan::call('nmrxiv:notify-inactive-projects');
+
+        Notification::assertNothingSent();
+    }
+
+    public function test_archived_or_deleted_projects_are_not_notified(): void
+    {
+        Notification::fake();
+
+        $owner = User::factory()->create();
+        Project::factory()->create([
+            'owner_id' => $owner->id,
+            'updated_at' => Carbon::now()->subMonths(12),
+            'is_deleted' => true,
+            'is_archived' => false,
+        ]);
+
+        Project::factory()->create([
+            'owner_id' => $owner->id,
+            'updated_at' => Carbon::now()->subMonths(12),
+            'is_deleted' => false,
+            'is_archived' => true,
+        ]);
+
+        Artisan::call('nmrxiv:notify-inactive-projects');
+
+        Notification::assertNothingSent();
+    }
+}