diff --git a/pkgs/by-name/cn/cnpypp/package.nix b/pkgs/by-name/cn/cnpypp/package.nix
new file mode 100644
index 000000000000..3cae99476f8f
--- /dev/null
+++ b/pkgs/by-name/cn/cnpypp/package.nix
@@ -0,0 +1,55 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  cmake,
+  boost,
+  libzip,
+  range-v3,
+}:
+
+stdenv.mkDerivation {
+  pname = "cnpypp";
+  version = "0-unstable-2025-06-22";
+
+  src = fetchFromGitHub {
+    owner = "mreininghaus";
+    repo = "cnpypp";
+    rev = "c6cd4e2078e4f39e862720b66fb211c45577c510";
+    hash = "sha256-aV57931nis0W2cwCNeMjQDip9Au7K76VpC/BqACnT5M=";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [
+    boost
+    libzip
+    range-v3
+  ];
+
+  cmakeFlags = [
+    (lib.cmakeFeature "CNPYPP_SPAN_IMPL" "BOOST")
+  ];
+
+  doCheck = stdenv.buildPlatform.canExecute stdenv.hostPlatform;
+
+  checkPhase = ''
+    runHook preCheck
+
+    ./example1
+    ./example2
+    ./example_c
+    ./range_example
+    ./range_zip_example
+    ./npz_speedtest
+
+    runHook postCheck
+  '';
+
+  meta = {
+    description = "C++17 library that allows to read and write NumPy data files";
+    homepage = "https://github.com/mreininghaus/cnpypp";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ jherland ];
+    platforms = lib.platforms.all;
+  };
+}