diff --git a/pkgs/by-name/os/osgqt/package.nix b/pkgs/by-name/os/osgqt/package.nix
index bb6277c1cb8e4..d2dd9ef77083d 100644
--- a/pkgs/by-name/os/osgqt/package.nix
+++ b/pkgs/by-name/os/osgqt/package.nix
@@ -1,12 +1,18 @@
 {
   cmake,
   fetchFromGitHub,
+  fetchpatch,
   lib,
   libsForQt5,
+  qt6Packages,
   openscenegraph,
   stdenv,
-}:
 
+  qt6Support ? false,
+}:
+let
+  qt = if qt6Support then qt6Packages else libsForQt5;
+in
 stdenv.mkDerivation (finalAttrs: {
   pname = "osgQt";
   version = "3.5.7-unstable-2025-10-08";
@@ -18,17 +24,38 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-+rjy2a266p755Mbfk6jRApiERpOL8axHklK0cYokX40=";
   };
 
-  buildInputs = [ libsForQt5.qtbase ];
+  patches = lib.optionals qt6Support [
+    (fetchpatch {
+      url = "https://github.com/DeadParrot/osgQt/commit/c4d48d1f05fda1dcb210418b89c75edf2157d85b.patch";
+      hash = "sha256-oq6R7BwXagXhxz3ClkD4qVSaNyfKawU5JK4Pq3QBKvU=";
+    })
+    (fetchpatch {
+      url = "https://github.com/DeadParrot/osgQt/commit/acbcdbec0026ad4b3979b6fa9311a1576f06b2cc.patch";
+      hash = "sha256-OJSITx/Lr4DwWM9vrLUiKh/cXZW+3jSAyNXLeyHPm3k=";
+    })
+  ];
+
+  postPatch = lib.optionalString qt6Support ''
+    mv include/osgQOpenGL/GraphicsWindowEx{,.h}
+    mv include/osgQOpenGL/OSGRenderer{,.h}
+    mv include/osgQOpenGL/RenderStageEx{,.h}
+    mv include/osgQOpenGL/StateEx{,.h}
+    mv include/osgQOpenGL/osgQOpenGLWidget{,.h}
+    mv include/osgQOpenGL/osgQOpenGLWindow{,.h}
+  '';
+
+  buildInputs = [ qt.qtbase ];
 
   nativeBuildInputs = [
     cmake
-    libsForQt5.wrapQtAppsHook
+    qt.wrapQtAppsHook
   ];
 
   propagatedBuildInputs = [ openscenegraph ];
 
   cmakeFlags = [
-    "-DDESIRED_QT_VERSION=5"
+    "-DBUILD_OSG_EXAMPLES=OFF"
+    "-DDESIRED_QT_VERSION=${if qt6Support then "6" else "5"}"
     "-DOpenGL_GL_PREFERENCE=GLVND"
   ];
 
diff --git a/pkgs/top-level/qt5-packages.nix b/pkgs/top-level/qt5-packages.nix
index c70f900e794b9..e51ceba4ed4ae 100644
--- a/pkgs/top-level/qt5-packages.nix
+++ b/pkgs/top-level/qt5-packages.nix
@@ -138,6 +138,8 @@ makeScopeWithSplicing' {
           qt = qt5;
         };
 
+        osgqt = pkgs.osgqt.override { qt6Support = false; };
+
         phonon = callPackage ../development/libraries/phonon { };
 
         phonon-backend-gstreamer = callPackage ../development/libraries/phonon/backends/gstreamer.nix { };
diff --git a/pkgs/top-level/qt6-packages.nix b/pkgs/top-level/qt6-packages.nix
index 1f47e74579e3a..b61ad6127293d 100644
--- a/pkgs/top-level/qt6-packages.nix
+++ b/pkgs/top-level/qt6-packages.nix
@@ -82,6 +82,8 @@ makeScopeWithSplicing' {
 
       maplibre-native-qt = callPackage ../development/libraries/maplibre-native-qt { };
 
+      osgqt = pkgs.osgqt.override { qt6Support = true; };
+
       qca = callPackage ../development/libraries/qca {
         inherit (qt6) qtbase qt5compat;
       };