diff --git a/pkgs/by-name/tb/tbb_2020/package.nix b/pkgs/by-name/tb/tbb_2020/package.nix
deleted file mode 100644
index a5d6b0fbb235..000000000000
--- a/pkgs/by-name/tb/tbb_2020/package.nix
+++ /dev/null
@@ -1,122 +0,0 @@
-{
-  lib,
-  stdenv,
-  fetchpatch,
-  fetchurl,
-  fetchFromGitHub,
-  fixDarwinDylibNames,
-}:
-
-stdenv.mkDerivation (finalAttrs: {
-  pname = "tbb";
-  version = "2020.3.3";
-
-  outputs = [
-    "out"
-    "dev"
-  ];
-
-  src = fetchFromGitHub {
-    owner = "oneapi-src";
-    repo = "oneTBB";
-    tag = "v${finalAttrs.version}";
-    hash = "sha256-pCZpQ+t7dDzuS4vhlfSVLwieI0iSQHukXb8Nk5kMMBo=";
-  };
-
-  patches = [
-    # Fixes build with Musl.
-    (fetchpatch {
-      url = "https://github.com/openembedded/meta-openembedded/raw/39185eb1d1615e919e3ae14ae63b8ed7d3e5d83f/meta-oe/recipes-support/tbb/tbb/GLIBC-PREREQ-is-not-defined-on-musl.patch";
-      hash = "sha256-Oo5FSBPPBaOziWEBOlRmTmbulExMsAmQWBR5faOj1a0=";
-    })
-
-    # Fixes build with Musl.
-    (fetchpatch {
-      url = "https://github.com/openembedded/meta-openembedded/raw/39185eb1d1615e919e3ae14ae63b8ed7d3e5d83f/meta-oe/recipes-support/tbb/tbb/0001-mallinfo-is-glibc-specific-API-mark-it-so.patch";
-      hash = "sha256-xp8J/il855VTFIKCN/bFtf+vif6HzcVl4t4/L9nW/xk=";
-    })
-
-    # Fixes build for aarch64-darwin
-    (fetchpatch {
-      name = "aarch64-darwin.patch";
-      url = "https://github.com/oneapi-src/oneTBB/pull/258/commits/86f6dcdc17a8f5ef2382faaef860cfa5243984fe.patch";
-      hash = "sha256-+sNU8yEsVVmQYOCKmlNiyJfKmB/U0GKAmrydwkfrDFQ=";
-    })
-  ];
-
-  nativeBuildInputs = (
-    lib.optionals stdenv.hostPlatform.isDarwin [
-      fixDarwinDylibNames
-    ]
-  );
-
-  makeFlags =
-    lib.optionals stdenv.cc.isClang [
-      "compiler=clang"
-    ]
-    ++ (lib.optional (stdenv.buildPlatform != stdenv.hostPlatform) (
-      if stdenv.hostPlatform.isAarch64 then
-        "arch=arm64"
-      else if stdenv.hostPlatform.isx86_64 then
-        "arch=intel64"
-      else if stdenv.hostPlatform.isi686 then
-        "arch=ia32"
-      else
-        throw "Unsupported cross architecture"
-    ));
-
-  # Fix undefined reference errors with version script under LLVM.
-  NIX_LDFLAGS = lib.optionalString (
-    stdenv.cc.bintools.isLLVM && lib.versionAtLeast stdenv.cc.bintools.version "17"
-  ) "--undefined-version";
-
-  enableParallelBuilding = true;
-
-  installPhase = ''
-    runHook preInstall
-
-    mkdir -p $out/lib
-    cp "build/"*release*"/"*${stdenv.hostPlatform.extensions.sharedLibrary}* $out/lib/
-    mv include $out/
-    rm $out/include/index.html
-
-    runHook postInstall
-  '';
-
-  pcTemplate = fetchurl {
-    url = "https://github.com/oneapi-src/oneTBB/raw/478de5b1887c928e52f029d706af6ea640a877be/integration/pkg-config/tbb.pc.in";
-    hash = "sha256-2pCad9txSpNbzac0vp/VY3x7HNySaYkbH3Rx8LK53pI=";
-  };
-
-  postInstall = ''
-    # Generate pkg-config file based on upstream template.
-    # It should not be necessary with tbb after 2021.2.
-    mkdir -p "$out/lib/pkgconfig"
-    substitute "${finalAttrs.pcTemplate}" "$out/lib/pkgconfig/tbb.pc" \
-    --subst-var-by CMAKE_INSTALL_PREFIX "$out" \
-    --subst-var-by CMAKE_INSTALL_LIBDIR "lib" \
-    --subst-var-by CMAKE_INSTALL_INCLUDEDIR "include" \
-    --subst-var-by TBB_VERSION "${finalAttrs.version}" \
-    --subst-var-by TBB_LIB_NAME "tbb"
-  '';
-
-  meta = {
-    description = "Intel Thread Building Blocks C++ Library";
-    homepage = "http://threadingbuildingblocks.org/";
-    license = lib.licenses.asl20;
-    longDescription = ''
-      Intel Threading Building Blocks offers a rich and complete approach to
-      expressing parallelism in a C++ program. It is a library that helps you
-      take advantage of multi-core processor performance without having to be a
-      threading expert. Intel TBB is not just a threads-replacement library. It
-      represents a higher-level, task-based parallelism that abstracts platform
-      details and threading mechanisms for scalability and performance.
-    '';
-    platforms = lib.platforms.unix;
-    maintainers = with lib.maintainers; [
-      silvanshade
-      thoughtpolice
-      tmarkus
-    ];
-  };
-})
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 5851719a7ba8..ad3a96c2543f 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -2384,6 +2384,7 @@ mapAliases {
   taplo-lsp = taplo; # Added 2022-07-30
   targetcli = targetcli-fb; # Added 2025-03-14
   taro = taproot-assets; # Added 2023-07-04
+  tbb_2020 = throw "tbb_2020 has been removed because it is unmaintained upstream and had no remaining users; use tbb_2022"; # Added 2025-09-14
   tbb_2021 = throw "tbb_2021 has been removed because it is unmaintained upstream and had no remaining users; use tbb_2022"; # Added 2025-09-13
   tcl-fcgi = tclPackages.tcl-fcgi; # Added 2024-10-02
   tclcurl = tclPackages.tclcurl; # Added 2024-10-02