diff --git a/pkgs/development/python-modules/cmsdials/default.nix b/pkgs/development/python-modules/cmsdials/default.nix
new file mode 100644
index 000000000000..3f06a5077b16
--- /dev/null
+++ b/pkgs/development/python-modules/cmsdials/default.nix
@@ -0,0 +1,53 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  poetry-core,
+  pydantic,
+  requests,
+  typing-extensions,
+  pandas,
+  tqdm,
+}:
+
+buildPythonPackage rec {
+  pname = "cmsdials";
+  version = "1.2.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "cms-DQM";
+    repo = "dials-py";
+    rev = "v${version}";
+    hash = "sha256-664FvPdZFU5eTcMadnHfs0ZeiKqTH+Gy2bnhIFQxU2o=";
+  };
+
+  build-system = [ poetry-core ];
+
+  dependencies = [
+    pydantic
+    requests
+    typing-extensions
+  ];
+
+  optional-dependencies = {
+    pandas = [ pandas ];
+    tqdm = [ tqdm ];
+  };
+
+  pythonRelaxDeps = [
+    # pydantic = "<2, >=1"pydantic = "<2, >=1"
+    "pydantic"
+    # typing-extensions = "<4.6.0, >=3.6.6"
+    "typing-extensions"
+  ];
+
+  pythonImportsCheck = [ "cmsdials" ];
+
+  meta = with lib; {
+    description = "Python API client interface to CMS DIALS service";
+    homepage = "https://github.com/cms-DQM/dials-py";
+    license = licenses.gpl3Only;
+    maintainers = with maintainers; [ ShamrockLee ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 0846477c1b93..66423898d7c7 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2375,6 +2375,8 @@ self: super: with self; {
     inherit (pkgs) cmigemo;
   };
 
+  cmsdials = callPackage ../development/python-modules/cmsdials { };
+
   cmsis-pack-manager = callPackage ../development/python-modules/cmsis-pack-manager { };
 
   cmsis-svd = callPackage ../development/python-modules/cmsis-svd { };