diff --git a/pkgs/development/libraries/bencode/default.nix b/pkgs/development/libraries/bencode/default.nix
new file mode 100644
index 00000000000..8b75e877e0a
--- /dev/null
+++ b/pkgs/development/libraries/bencode/default.nix
@@ -0,0 +1,57 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, catch2
+, cmake
+, expected-lite
+, fmt
+, gsl-lite
+, ninja
+}:
+
+stdenv.mkDerivation rec {
+  pname = "bencode";
+  version = "0.5.0";
+
+  src = fetchFromGitHub {
+    owner = "fbdtemme";
+    repo = "bencode";
+    rev = "v${version}";
+    hash = "sha256-ePbQ6oTumQ+T5TOb+ReaOYa8Q3lvcMBZ6jTMoquTngg=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+    ninja
+  ];
+
+  buildInputs = [
+    catch2
+    expected-lite
+    fmt
+    gsl-lite
+  ];
+
+  postPatch = ''
+    # Disable a test that requires an internet connection.
+    substituteInPlace tests/CMakeLists.txt \
+      --replace "add_subdirectory(cmake_fetch_content)" ""
+  '';
+
+  doCheck = true;
+
+  postInstall = ''
+    rm -rf $out/lib64
+  '';
+
+  meta = with lib; {
+    description = "A header-only C++20 bencode serialization/deserialization library";
+    homepage = "https://github.com/fbdtemme/bencode";
+    changelog = "https://github.com/fbdtemme/bencode/blob/${src.rev}/CHANGELOG.md";
+    license = licenses.mit;
+    maintainers = with maintainers; [ azahi ];
+    platforms = platforms.unix;
+    # Broken because the default stdenv on these targets doesn't support C++20.
+    broken = with stdenv; isDarwin || (isLinux && isAarch64);
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 51a52a44915..31526600478 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -18197,6 +18197,10 @@ with pkgs;
 
   belr = callPackage ../development/libraries/belr { };
 
+  bencode = callPackage ../development/libraries/bencode {
+    stdenv = gcc10StdenvCompat;
+  };
+
   bencodetools = callPackage ../development/libraries/bencodetools { };
 
   beignet = callPackage ../development/libraries/beignet {