diff --git a/conda/environments/all_cuda-129_arch-aarch64.yaml b/conda/environments/all_cuda-129_arch-aarch64.yaml
index 71bd3873d456..64d049f0005f 100644
--- a/conda/environments/all_cuda-129_arch-aarch64.yaml
+++ b/conda/environments/all_cuda-129_arch-aarch64.yaml
@@ -77,7 +77,6 @@ dependencies:
 - polars>=1.35,<1.42
 - pre-commit
 - pyarrow>=19.0.0,<24
-- pydata-sphinx-theme>=0.15.4
 - pytables
 - pytest-benchmark
 - pytest-cases>=3.8.2
@@ -118,4 +117,6 @@ dependencies:
 - xlsxwriter
 - zlib>=1.2.13
 - zstandard
+- pip:
+  - nvidia-sphinx-theme
 name: all_cuda-129_arch-aarch64
diff --git a/conda/environments/all_cuda-129_arch-x86_64.yaml b/conda/environments/all_cuda-129_arch-x86_64.yaml
index 5bf990d78f91..2ac4a7125801 100644
--- a/conda/environments/all_cuda-129_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-129_arch-x86_64.yaml
@@ -77,7 +77,6 @@ dependencies:
 - polars>=1.35,<1.42
 - pre-commit
 - pyarrow>=19.0.0,<24
-- pydata-sphinx-theme>=0.15.4
 - pytables
 - pytest-benchmark
 - pytest-cases>=3.8.2
@@ -118,4 +117,6 @@ dependencies:
 - xlsxwriter
 - zlib>=1.2.13
 - zstandard
+- pip:
+  - nvidia-sphinx-theme
 name: all_cuda-129_arch-x86_64
diff --git a/conda/environments/all_cuda-133_arch-aarch64.yaml b/conda/environments/all_cuda-133_arch-aarch64.yaml
index ae7839c8303d..02f8cd6c6bc1 100644
--- a/conda/environments/all_cuda-133_arch-aarch64.yaml
+++ b/conda/environments/all_cuda-133_arch-aarch64.yaml
@@ -77,7 +77,6 @@ dependencies:
 - polars>=1.35,<1.42
 - pre-commit
 - pyarrow>=19.0.0,<24
-- pydata-sphinx-theme>=0.15.4
 - pytables
 - pytest-benchmark
 - pytest-cases>=3.8.2
@@ -118,4 +117,6 @@ dependencies:
 - xlsxwriter
 - zlib>=1.2.13
 - zstandard
+- pip:
+  - nvidia-sphinx-theme
 name: all_cuda-133_arch-aarch64
diff --git a/conda/environments/all_cuda-133_arch-x86_64.yaml b/conda/environments/all_cuda-133_arch-x86_64.yaml
index 5ae487fb98d8..bdb6e7f60624 100644
--- a/conda/environments/all_cuda-133_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-133_arch-x86_64.yaml
@@ -77,7 +77,6 @@ dependencies:
 - polars>=1.35,<1.42
 - pre-commit
 - pyarrow>=19.0.0,<24
-- pydata-sphinx-theme>=0.15.4
 - pytables
 - pytest-benchmark
 - pytest-cases>=3.8.2
@@ -118,4 +117,6 @@ dependencies:
 - xlsxwriter
 - zlib>=1.2.13
 - zstandard
+- pip:
+  - nvidia-sphinx-theme
 name: all_cuda-133_arch-x86_64
diff --git a/cpp/doxygen/header.html b/cpp/doxygen/header.html
index 569b8450e3ab..8c076e6f11d6 100644
--- a/cpp/doxygen/header.html
+++ b/cpp/doxygen/header.html
@@ -17,10 +17,6 @@
 <link href="$relpath^$stylesheet" rel="stylesheet" type="text/css" />
 $extrastylesheet
 
-<!-- RAPIDS CUSTOM JS & CSS: START, Please add these two lines back after every version upgrade -->
-<script defer src="https://docs.rapids.ai/assets/js/custom.js"></script>
-<link rel="stylesheet" href="https://docs.rapids.ai/assets/css/custom.css">
-<!-- RAPIDS CUSTOM JS & CSS: END -->
 </head>
 <body>
 <div id="top"><!-- do not remove this div, it is closed by doxygen! -->
diff --git a/dependencies.yaml b/dependencies.yaml
index bd99c363541a..cd95bfee5fb7 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -864,21 +864,15 @@ dependencies:
           - nbsphinx
           - numpydoc
           - pandoc
-          # Minimum version for safe parallel writing again.
-          # https://github.com/pydata/pydata-sphinx-theme/pull/1859
-          # https://github.com/pydata/pydata-sphinx-theme/releases/tag/v0.15.4
-          - pydata-sphinx-theme>=0.15.4
           - scipy
-          # Needed for safe parallel writes as with the pydata-sphinx-theme pin above
-          # https://github.com/sphinx-doc/sphinx/issues/12409
-          # https://github.com/sphinx-doc/sphinx/pull/12888
-          # https://github.com/sphinx-doc/sphinx/releases/tag/v8.1.0
           - sphinx>=8.1.0
           - sphinx-autobuild
           - sphinx-copybutton
           - sphinx-markdown-tables
           - sphinx-remove-toctrees
           - sphinxcontrib-websupport
+          - pip:
+              - nvidia-sphinx-theme
   notebooks:
     common:
       - output_types: [conda, requirements]
diff --git a/docs/cudf/source/_templates/sidebar-nav-bs.html b/docs/cudf/source/_templates/sidebar-nav-bs.html
new file mode 100644
index 000000000000..92633b7e35fc
--- /dev/null
+++ b/docs/cudf/source/_templates/sidebar-nav-bs.html
@@ -0,0 +1,44 @@
+{#
+  Override PyData Sphinx Theme's sidebar-nav-bs.html component.
+
+  NVIDIA Sphinx Theme inherits PyData's default primary sidebar configuration,
+  which includes this component by template name. Placing a file with the same
+  name in the project's _templates directory makes Sphinx use this version.
+
+  PyData's generate_toctree_html("sidebar", startdepth=1, ...) returns the
+  normal sidebar tree rooted at the currently active top-level toctree item.
+  That is correct for nested pages such as cudf/api_docs/index, where the
+  sidebar should still show the active API reference node and its foldable
+  children. For top-level section landing pages such as cudf_pandas/index,
+  that output duplicates the primary navbar item in the sidebar, so we render
+  only the active section's child <ul> on those landing pages.
+#}
+{% set show_nav_level = meta['html_theme.show_nav_level'] if (meta is defined and meta is not none and 'html_theme.show_nav_level' in meta) else theme_show_nav_level %}
+{% set special_page = pagename == root_doc or pagename in ["genindex", "py-modindex", "search"] %}
+{% if not special_page %}
+  {% set nav_tree = generate_toctree_html(
+    "sidebar",
+    startdepth=1,
+    show_nav_level=show_nav_level | int,
+    maxdepth=theme_navigation_depth | int,
+    collapse=theme_collapse_navigation | tobool,
+    includehidden=theme_sidebar_includehidden | tobool,
+    titles_only=True,
+  ) %}
+  {% set pagename_parts = pagename.split("/") %}
+  {% set top_section_page = pagename_parts | length == 2 and pagename_parts[-1] == "index" %}
+  {% if top_section_page %}
+    {% set active_section = nav_tree.select_one("li.toctree-l1.current") %}
+    {% set active_details = active_section.find("details", recursive=False) if active_section else none %}
+    {% set section_nav = active_details.find("ul", recursive=False) if active_details else nav_tree %}
+  {% else %}
+    {% set section_nav = nav_tree %}
+  {% endif %}
+  <nav class="bd-docs-nav bd-links"
+       aria-label="{{ _('Section Navigation') }}">
+    <p class="bd-links__title" role="heading" aria-level="1">{{ _("Section Navigation") }}</p>
+    <div class="bd-toc-item navbar-nav">
+      {{ section_nav }}
+    </div>
+  </nav>
+{% endif %}
diff --git a/docs/cudf/source/conf.py b/docs/cudf/source/conf.py
index 479371c6d435..c2f4754a6b46 100644
--- a/docs/cudf/source/conf.py
+++ b/docs/cudf/source/conf.py
@@ -179,7 +179,7 @@ def clean_all_xml_files(path):
 master_doc = "index"
 
 # General information about the project.
-project = "cudf"
+project = "cuDF"
 copyright = f"2018-{datetime.datetime.today().year}, NVIDIA Corporation"
 author = "NVIDIA Corporation"
 
@@ -226,12 +226,12 @@ def clean_all_xml_files(path):
 
 html_theme_options = {
     "external_links": [],
-    # https://github.com/pydata/pydata-sphinx-theme/issues/1220
     "icon_links": [],
     "github_url": "https://github.com/rapidsai/cudf",
     "twitter_url": "https://twitter.com/rapidsai",
     "show_toc_level": 1,
     "navbar_align": "content",
+    "navbar_center": "navbar-nav, version-switcher, navbar-external-links",
     "navigation_with_keys": True,
 }
 include_pandas_compat = True
@@ -241,8 +241,7 @@ def clean_all_xml_files(path):
 # a list of builtin themes.
 #
 
-html_theme = "pydata_sphinx_theme"
-html_logo = "_static/RAPIDS-logo-purple.png"
+html_theme = "nvidia_sphinx_theme"
 
 
 # Theme options are theme-specific and customize the look and feel of a theme
@@ -780,10 +779,6 @@ def add_content(self, more_content) -> None:
 
 
 def setup(app):
-    app.add_css_file("https://docs.rapids.ai/assets/css/custom.css")
-    app.add_js_file(
-        "https://docs.rapids.ai/assets/js/custom.js", loading_method="defer"
-    )
     app.connect("doctree-read", resolve_aliases)
     app.connect("missing-reference", on_missing_reference)
     app.setup_extension("sphinx.ext.autodoc")
diff --git a/docs/cudf/source/cudf/developer_guide/documentation.md b/docs/cudf/source/cudf/developer_guide/documentation.md
index d577c3932c54..503baf44c7d9 100644
--- a/docs/cudf/source/cudf/developer_guide/documentation.md
+++ b/docs/cudf/source/cudf/developer_guide/documentation.md
@@ -95,7 +95,7 @@ Section name
 ```
 
 Each listed will automatically have its docstring rendered into a separate page.
-This layout comes from [PyData Sphinx Theme](https://pydata-sphinx-theme.readthedocs.io/en/stable/index.html).
+This layout comes from [NVIDIA Sphinx Theme](https://pypi.org/project/nvidia-sphinx-theme/).
 
 ````{note}
 Autosummary generates stub pages that look like this (using `cudf.concat` as an example):
diff --git a/docs/dask_cudf/source/_templates/sidebar-nav-bs.html b/docs/dask_cudf/source/_templates/sidebar-nav-bs.html
new file mode 120000
index 000000000000..a09b1f8162f2
--- /dev/null
+++ b/docs/dask_cudf/source/_templates/sidebar-nav-bs.html
@@ -0,0 +1 @@
+../../../cudf/source/_templates/sidebar-nav-bs.html
\ No newline at end of file
diff --git a/docs/dask_cudf/source/conf.py b/docs/dask_cudf/source/conf.py
index 1d66357e10cd..93694b7f1ecc 100644
--- a/docs/dask_cudf/source/conf.py
+++ b/docs/dask_cudf/source/conf.py
@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2018-2026, NVIDIA CORPORATION.
+# SPDX-FileCopyrightText: Copyright (c) 2018-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 # Configuration file for the Sphinx documentation builder.
@@ -16,7 +16,7 @@
 
 DASK_CUDF_VERSION = Version(dask_cudf.__version__)
 
-project = "dask-cudf"
+project = "dask-cuDF"
 copyright = f"2018-{datetime.datetime.today().year}, NVIDIA Corporation"
 author = "NVIDIA Corporation"
 version = f"{DASK_CUDF_VERSION.major:02}.{DASK_CUDF_VERSION.minor:02}"
@@ -50,8 +50,7 @@
 # -- Options for HTML output -------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
-html_theme = "pydata_sphinx_theme"
-html_logo = "_static/RAPIDS-logo-purple.png"
+html_theme = "nvidia_sphinx_theme"
 htmlhelp_basename = "dask-cudfdoc"
 html_use_modindex = True
 
@@ -65,6 +64,7 @@
     "twitter_url": "https://twitter.com/rapidsai",
     "show_toc_level": 1,
     "navbar_align": "right",
+    "navbar_center": "navbar-nav, version-switcher, navbar-external-links",
     "navigation_with_keys": True,
 }
 include_pandas_compat = True
@@ -86,10 +86,3 @@
 numpydoc_attributes_as_param_list = False
 
 nitpicky = True
-
-
-def setup(app):
-    app.add_css_file("https://docs.rapids.ai/assets/css/custom.css")
-    app.add_js_file(
-        "https://docs.rapids.ai/assets/js/custom.js", loading_method="defer"
-    )
