diff --git a/pkgs/by-name/cl/clblas/package.nix b/pkgs/by-name/cl/clblas/package.nix
deleted file mode 100644
index f77834528d23..000000000000
--- a/pkgs/by-name/cl/clblas/package.nix
+++ /dev/null
@@ -1,83 +0,0 @@
-{
-  lib,
-  stdenv,
-  llvmPackages_19,
-  fetchFromGitHub,
-  fetchpatch,
-  cmake,
-  gfortran,
-  blas,
-  boost,
-  python3,
-  ocl-icd,
-  opencl-headers,
-}:
-
-let
-  stdenv' = if stdenv.hostPlatform.isDarwin then llvmPackages_19.stdenv else stdenv;
-in
-
-stdenv'.mkDerivation (finalAttrs: {
-  pname = "clblas";
-  version = "2.12";
-
-  src = fetchFromGitHub {
-    owner = "clMathLibraries";
-    repo = "clBLAS";
-    tag = "v${finalAttrs.version}";
-    hash = "sha256-Wq5oBl3TW3qpK0cyNWVgJMS5/s8xY1dulqDCkkX5lZQ=";
-  };
-
-  patches = [
-    ./platform.patch
-    (fetchpatch {
-      url = "https://github.com/clMathLibraries/clBLAS/commit/68ce5f0b824d7cf9d71b09bb235cf219defcc7b4.patch";
-      hash = "sha256-XoVcHgJ0kTPysZbM83mUX4/lvXVHKbl7s2Q8WWiUnMs=";
-    })
-  ];
-
-  postPatch = ''
-    sed -i -re 's/(set\(\s*Boost_USE_STATIC_LIBS\s+).*/\1OFF\ \)/g' src/CMakeLists.txt
-
-    substituteInPlace src/CMakeLists.txt \
-      --replace-fail "cmake_minimum_required(VERSION 2.8)" "cmake_minimum_required(VERSION 3.10)"
-    substituteInPlace src/library/tools/tplgen/CMakeLists.txt \
-      --replace-fail "cmake_minimum_required(VERSION 2.6)" "cmake_minimum_required(VERSION 3.10)"
-  '';
-
-  preConfigure = ''
-    cd src
-  '';
-
-  cmakeFlags = [
-    "-DBUILD_TEST=OFF"
-  ];
-
-  nativeBuildInputs = [
-    cmake
-    gfortran
-    python3
-  ];
-  buildInputs = [
-    blas
-    boost
-  ]
-  ++ lib.optionals (!stdenv.hostPlatform.isDarwin) [
-    ocl-icd
-    opencl-headers
-  ];
-
-  strictDeps = true;
-
-  meta = {
-    homepage = "https://github.com/clMathLibraries/clBLAS";
-    description = "Software library containing BLAS functions written in OpenCL";
-    longDescription = ''
-      This package contains a library of BLAS functions on top of OpenCL.
-    '';
-    license = lib.licenses.asl20;
-    maintainers = [ ];
-    platforms = lib.platforms.unix;
-  };
-
-})
diff --git a/pkgs/by-name/cl/clblas/platform.patch b/pkgs/by-name/cl/clblas/platform.patch
deleted file mode 100644
index 87404a426a4b..000000000000
--- a/pkgs/by-name/cl/clblas/platform.patch
+++ /dev/null
@@ -1,34 +0,0 @@
-diff --git a/src/library/tools/ktest/config.cpp b/src/library/tools/ktest/config.cpp
-index 8b20128..faf9bde 100644
---- a/src/library/tools/ktest/config.cpp
-+++ b/src/library/tools/ktest/config.cpp
-@@ -24,8 +24,6 @@
- 
- using namespace clMath;
- 
--static const char DEFAULT_PLATFORM_NAME[] = "AMD Accelerated Parallel Processing";
--
- Config::Config() :
-     defaultConfig_(""),
-     cpp_("ktest.cpp"),
-@@ -35,7 +33,10 @@ Config::Config() :
-     hasFuncID_(false), hasSubdims_(false),
-     skipAccuracy_(false)
- {
--    setPlatform(DEFAULT_PLATFORM_NAME);
-+    platform_ = NULL;
-+    setPlatform("");
-+
-+    device_ = NULL;
-     setDevice("");
- 
-     memset(&kargs_, 0, sizeof(kargs_));
-@@ -262,7 +263,7 @@ Config::setPlatform(const std::string& name)
-             continue;
-         }
-         if (name.empty()) {
--            found = (strcmp(pname, DEFAULT_PLATFORM_NAME) == 0);
-+	    found = true;
-         }
-         else {
-             found = (strcmp(pname, name.c_str()) == 0);
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 0b78ef8b2e8e..1546f7b5cbe7 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -560,6 +560,7 @@ mapAliases {
   classads = throw "'classads' has been removed, as it is unmaintained both upstream and in nixpkgs"; # Added 2026-06-27
   claude-code-acp = warnAlias "'claude-code-acp' has been renamed to 'claude-agent-acp'" claude-agent-acp; # Added 2026-03-31
   claude-code-bin = warnAlias "'claude-code-bin' has been merged into 'claude-code'" claude-code; # Added 2026-04-18
+  clblas = throw "'clblas' has been removed as it was unmaintained upstream"; # Added 2026-09-02
   clearlyU = clearly-u; # Added 2026-02-08
   cli-visualizer = throw "'cli-visualizer' has been removed as the upstream repository is gone"; # Added 2025-06-05
   clima = throw "'clima' has been removed, as it has been unmaintained upstream since December 2024, use glow instead"; # Added 2026-01-01