diff --git a/pkgs/by-name/ct/ctpp2/package.nix b/pkgs/by-name/ct/ctpp2/package.nix
deleted file mode 100644
index 45590ddef419..000000000000
--- a/pkgs/by-name/ct/ctpp2/package.nix
+++ /dev/null
@@ -1,38 +0,0 @@
-{
-  lib,
-  stdenv,
-  fetchurl,
-  cmake,
-}:
-
-stdenv.mkDerivation rec {
-  pname = "ctpp2";
-  version = "2.8.3";
-
-  src = fetchurl {
-    url = "https://ctpp.havoc.ru/download/${pname}-${version}.tar.gz";
-    sha256 = "1z22zfw9lb86z4hcan9hlvji49c9b7vznh7gjm95gnvsh43zsgx8";
-  };
-
-  nativeBuildInputs = [ cmake ];
-
-  patchPhase = ''
-    # include <unistd.h> to fix undefined getcwd
-    sed -i -e 's/<stdlib.h>/<stdlib.h>\n#include <unistd.h>/' src/CTPP2FileSourceLoader.cpp
-  '';
-
-  cmakeFlags = [
-    # RPATH of binary /nix/store/.../bin/ctpp2json contains a forbidden reference to /build/
-    "-DCMAKE_SKIP_BUILD_RPATH=ON"
-  ];
-
-  doCheck = false; # fails
-
-  meta = {
-    description = "High performance templating engine";
-    homepage = "https://ctpp.havoc.ru/";
-    maintainers = [ lib.maintainers.robbinch ];
-    platforms = lib.platforms.linux;
-    license = lib.licenses.bsd2;
-  };
-}
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 181e875e7708..3dbf40cc5018 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -483,6 +483,7 @@ mapAliases {
   crystal_1_11 = throw "'crystal_1_11' has been removed as it is obsolete and no longer used in the tree. Consider using 'crystal' instead"; # Added 2025-09-04
   csslint = throw "'csslint' has been removed as upstream considers it abandoned."; # Addeed 2025-11-07
   cstore_fdw = throw "'cstore_fdw' has been removed. Use 'postgresqlPackages.cstore_fdw' instead."; # Added 2025-07-19
+  ctpp2 = throw "'ctpp2' has been removed due to lack of maintenance."; # Added 2025-12-31
   cudaPackages_11 = throw "CUDA 11 has been removed from Nixpkgs, as it is unmaintained upstream and depends on unsupported compilers"; # Added 2025-08-08
   cudaPackages_11_0 = throw "CUDA 11.0 has been removed from Nixpkgs, as it is unmaintained upstream and depends on unsupported compilers"; # Added 2025-08-08
   cudaPackages_11_1 = throw "CUDA 11.1 has been removed from Nixpkgs, as it is unmaintained upstream and depends on unsupported compilers"; # Added 2025-08-08