diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff07da4..e89338d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 ## CHANGELOG
 
+v1.39 (2020-10-17)
+ **Features and Improvements**
+
+ * Added new models support: CustomField
+
 v1.38 (2019-05-11)
  **Features and Improvements**
 
diff --git a/README.md b/README.md
index 1afa3d0..dd76b8f 100644
--- a/README.md
+++ b/README.md
@@ -212,6 +212,21 @@ Actions:
 * Update a contact - `client.contacts.update`
 * Delete a contact - `client.contacts.destroy`
 
+### Custom Fields
+
+```ruby
+client = BaseCRM::Client.new(access_token: "<YOUR_PERSONAL_ACCESS_TOKEN>")
+client.custom_fields # => BaseCRM::CustomFieldsService
+```
+
+Actions:
+* Retrieve all custom fields - `client.custom_fields.all('contact')`
+    * `all` excepts the following `resource_type` parameters:
+        * `lead`
+        * `contact`
+        * `deal`
+        * `prospect_and_customer`
+
 ### Deal
 
 ```ruby
diff --git a/lib/basecrm.rb b/lib/basecrm.rb
index 57fd3bc..9db9d98 100644
--- a/lib/basecrm.rb
+++ b/lib/basecrm.rb
@@ -17,6 +17,7 @@
 require 'basecrm/models/call'
 require 'basecrm/models/call_outcome'
 require 'basecrm/models/contact'
+require 'basecrm/models/custom_field'
 require 'basecrm/models/deal'
 require 'basecrm/models/deal_source'
 require 'basecrm/models/deal_unqualified_reason'
@@ -48,6 +49,7 @@
 require 'basecrm/services/calls_service'
 require 'basecrm/services/call_outcomes_service'
 require 'basecrm/services/contacts_service'
+require 'basecrm/services/custom_fields_service'
 require 'basecrm/services/deals_service'
 require 'basecrm/services/deal_sources_service'
 require 'basecrm/services/deal_unqualified_reasons_service'
@@ -109,6 +111,14 @@ def accounts
       @accounts ||= AccountsService.new(@http_client)
     end
 
+    # Access all Custom Field related actions.
+    # @see CustomFieldsService
+    # @see CustomField
+    #
+    # @return [CustomFieldsService] Service object for resources.
+    def custom_fields
+      @custom_fields ||= CustomFieldsService.new(@http_client)
+    end
     # Access all AssociatedContacts related actions.
     # @see AssociatedContactsService
     # @see AssociatedContact
diff --git a/lib/basecrm/models/custom_field.rb b/lib/basecrm/models/custom_field.rb
new file mode 100644
index 0000000..48cbfa5
--- /dev/null
+++ b/lib/basecrm/models/custom_field.rb
@@ -0,0 +1,20 @@
+module BaseCRM
+  class CustomField < Model
+    # @!attribute [r] created_at
+    #   @return [DateTime] Date and time of the account's creation in UTC (ISO8601 format).
+    # @!attribute [r] updated_at
+    #   @return [DateTime] Date and time of the last update in UTC (ISO8601 format).
+    # @!attribute [r] id
+    #   @return [Integer] Unique identifier of the custom field.
+    # @!attribute [r] name
+    #   @return [String] Name of the custom field.
+    # @!attribute [r] type
+    #   @return [String] Type of the custom field.
+    # @!attribute [r] choices
+    #   @return [Array] Represents choices that can be used for this particular custom field (applicable only for multi_select_list and list).
+    # @!attribute [r] for_organisation
+    #   @return [Boolean] Whether custom field should be available on Contact: Company (applicable only for resource_type=contact).
+    # @!attribute [r] for_contact
+    #   @return [Boolean] Whether custom field should be available on Contact: Person (applicable only for resource_type=contact).
+  end
+end
diff --git a/lib/basecrm/services/custom_fields_service.rb b/lib/basecrm/services/custom_fields_service.rb
new file mode 100644
index 0000000..07a4fd8
--- /dev/null
+++ b/lib/basecrm/services/custom_fields_service.rb
@@ -0,0 +1,37 @@
+module BaseCRM
+  class CustomFieldsService
+    RESOURCE_TYPES = %w[lead contact deal prospect_and_customer].freeze
+
+    def initialize(client)
+      @client = client
+    end
+
+    # Retrieve custom field details for a resource type
+    #
+    # get '/:resource_type/custom_fields'
+    #
+    # Returns detailed information about your custom fields
+    #
+    # @return [Array] Array of CustomField
+    def all(resource_type)
+      raise IncorrectResourceType unless RESOURCE_TYPES.include?(resource_type)
+
+      _, _, root = @client.get("/#{resource_type}/custom_fields", {})
+      root[:items].map { |item| CustomField.new(item[:data]) }
+    end
+
+    private
+
+    def validate_type!(custom_field)
+      raise TypeError unless custom_field.is_a?(CustomField) || custom_field.is_a?(Hash)
+    end
+
+    def extract_params!(custom_field, *args)
+      params = custom_field.to_h.select { |k, _| args.include?(k) }
+      raise ArgumentError, "one of required attributes is missing. Expected: #{args.join(',')}" if params.count != args.length
+      params
+    end
+
+    class IncorrectResourceType < StandardError; end
+  end
+end
diff --git a/lib/basecrm/version.rb b/lib/basecrm/version.rb
index 4a7ec27..2ecdb9c 100644
--- a/lib/basecrm/version.rb
+++ b/lib/basecrm/version.rb
@@ -1,3 +1,3 @@
 module BaseCRM
-  VERSION = "1.3.8"
+  VERSION = "1.3.9"
 end
diff --git a/spec/services/custom_fields_service_spec.rb b/spec/services/custom_fields_service_spec.rb
new file mode 100644
index 0000000..ed67e57
--- /dev/null
+++ b/spec/services/custom_fields_service_spec.rb
@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe BaseCRM::CustomFieldsService do
+  describe 'Responds to' do
+    subject { client.custom_fields  }
+
+    it { should respond_to :all }
+  end
+
+  describe :all do
+    it "returns an array" do
+      expect(client.custom_fields.all('contact')).to be_instance_of(Array)
+    end
+
+    it 'raises IncorrectResourceType if resource type not approved' do
+      expect do
+        client.custom_fields.all('not_valid')
+      end.to raise_exception(BaseCRM::CustomFieldsService::IncorrectResourceType)
+    end
+  end
+end