diff --git a/pkgs/development/python-modules/detectron2/default.nix b/pkgs/development/python-modules/detectron2/default.nix
deleted file mode 100644
index d835135ee3a3..000000000000
--- a/pkgs/development/python-modules/detectron2/default.nix
+++ /dev/null
@@ -1,205 +0,0 @@
-{
-  stdenv,
-  lib,
-  buildPythonPackage,
-  fetchFromGitHub,
-
-  # nativeBuildInputs
-  ninja,
-  which,
-
-  # buildInputs
-  pybind11,
-
-  # dependencies
-  black,
-  cloudpickle,
-  fvcore,
-  hydra-core,
-  iopath,
-  matplotlib,
-  omegaconf,
-  packaging,
-  pillow,
-  pycocotools,
-  pydot,
-  tabulate,
-  tensorboard,
-  termcolor,
-  torch,
-  tqdm,
-  yacs,
-
-  # optional-dependencies
-  fairscale,
-  psutil,
-  pygments,
-  scipy,
-  shapely,
-  timm,
-
-  # tests
-  av,
-  opencv4,
-  pytest-mock,
-  pytestCheckHook,
-  torchvision,
-  pythonAtLeast,
-}:
-
-buildPythonPackage (finalAttrs: {
-  pname = "detectron2";
-  version = "0.6";
-  pyproject = true;
-
-  src = fetchFromGitHub {
-    owner = "facebookresearch";
-    repo = "detectron2";
-    tag = "v${finalAttrs.version}";
-    hash = "sha256-TosuUZ1hJrXF3VGzsGO2hmQJitGUxe7FyZyKjNh+zPA=";
-  };
-
-  postPatch =
-    # https://github.com/facebookresearch/detectron2/issues/5010
-    ''
-      substituteInPlace detectron2/data/transforms/transform.py \
-        --replace-fail "interp=Image.LINEAR" "interp=Image.BILINEAR"
-    '';
-
-  nativeBuildInputs = [
-    ninja
-    which
-  ];
-
-  buildInputs = [ pybind11 ];
-
-  pythonRelaxDeps = [
-    "black"
-    "iopath"
-  ];
-
-  pythonRemoveDeps = [
-    "future"
-  ];
-
-  dependencies = [
-    black
-    cloudpickle
-    fvcore
-    hydra-core
-    iopath
-    matplotlib
-    omegaconf
-    packaging
-    pillow
-    pycocotools
-    pydot # no idea why this is not in their setup.py
-    tabulate
-    tensorboard
-    termcolor
-    torch # not explicitly declared in setup.py because they expect you to install it yourself
-    tqdm
-    yacs
-  ];
-
-  optional-dependencies = {
-    all = [
-      fairscale
-      timm
-      scipy
-      shapely
-      pygments
-      psutil
-    ];
-  };
-
-  nativeCheckInputs = [
-    av
-    opencv4
-    pytest-mock
-    pytestCheckHook
-    torchvision
-  ];
-
-  preCheck =
-    # prevent import errors for C extension modules
-    ''
-      rm -r detectron2
-    '';
-
-  enabledTestPaths = [
-    # prevent include $sourceRoot/projects/*/tests
-    "tests"
-  ];
-
-  disabledTestPaths = [
-    # try import caffe2
-    "tests/test_export_torchscript.py"
-    "tests/test_model_analysis.py"
-    "tests/modeling/test_backbone.py"
-    "tests/modeling/test_roi_heads.py"
-    "tests/modeling/test_rpn.py"
-    "tests/structures/test_instances.py"
-    # hangs for some reason
-    "tests/modeling/test_model_e2e.py"
-    # KeyError: 'precision'
-    "tests/data/test_coco_evaluation.py"
-  ];
-
-  disabledTests = [
-    # fails for some reason
-    "test_checkpoint_resume"
-    "test_map_style"
-    # requires shapely
-    "test_resize_and_crop"
-    # require caffe2
-    "test_predict_boxes_tracing"
-    "test_predict_probs_tracing"
-    "testMaskRCNN"
-    "testRetinaNet"
-    # require coco dataset
-    "test_default_trainer"
-    "test_unknown_category"
-    "test_build_dataloader_train"
-    "test_build_iterable_dataloader_train"
-    # require network access
-    "test_opencv_exif_orientation"
-    "test_read_exif_orientation"
-    # use deprecated api, numpy.bool
-    "test_BWmode_nomask"
-    "test_draw_binary_mask"
-    "test_draw_empty_mask_predictions"
-    "test_draw_instance_predictions"
-    "test_draw_no_metadata"
-    "test_overlay_instances"
-    "test_overlay_instances_no_boxes"
-    "test_get_bounding_box"
-  ]
-  ++ lib.optionals (stdenv.hostPlatform.isLinux && stdenv.hostPlatform.isAarch64) [
-    "test_build_batch_dataloader_inference"
-    "test_build_dataloader_inference"
-    "test_build_iterable_dataloader_inference"
-    "test_to_iterable"
-  ]
-  ++ lib.optionals stdenv.hostPlatform.isDarwin [
-    # RuntimeError: required keyword attribute 'value' has the wrong type
-    "test_apply_deltas_tracing"
-    "test_imagelist_padding_tracing"
-    "test_roi_pooler_tracing"
-  ]
-  ++ lib.optionals (pythonAtLeast "3.14") [
-    # AttributeError: '...' object has no attribute '__annotations__'
-    "test_default_anchor_generator_centered"
-    "test_scriptability_cpu"
-    "test_scriptable_cpu"
-  ];
-
-  pythonImportsCheck = [ "detectron2" ];
-
-  meta = {
-    description = "Facebooks's next-generation platform for object detection, segmentation and other visual recognition tasks";
-    homepage = "https://github.com/facebookresearch/detectron2";
-    license = lib.licenses.asl20;
-    maintainers = with lib.maintainers; [ happysalada ];
-  };
-})
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index fac78031fbdb..2867d8aa5f78 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -186,6 +186,7 @@ mapAliases {
   dedupe-pylbfgs = pylbfgs; # added 2026-06-28
   deepsearch-glm = throw "'deepsearch-glm' has been removed due to lack of upstream maintenance"; # Added 2025-03-04
   derpconf = throw "'derpconf' has been removed because it is unmaintained upstream"; # Added 2026-09-05
+  detectron2 = throw "'detectron2' has been removed because it is unmaintained upstream"; # Added 2026-09-06
   dictionaries = throw "'dictionaries' has been removed as it was archived upstream"; # Added 2026-07-20
   dictpath = throw "'dictpath' has been renamed to/replaced by 'pathable'"; # Converted to throw 2025-10-29
   diff_cover = throw "'diff_cover' has been renamed to/replaced by 'diff-cover'"; # Converted to throw 2025-10-29
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 29960a47fe05..514325987605 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4318,8 +4318,6 @@ self: super: with self; {
 
   detect-secrets = callPackage ../development/python-modules/detect-secrets { };
 
-  detectron2 = callPackage ../development/python-modules/detectron2 { };
-
   developer-disk-image = callPackage ../development/python-modules/developer-disk-image { };
 
   devgoldyutils = callPackage ../development/python-modules/devgoldyutils { };