diff --git a/pkgs/development/python-modules/biliass/default.nix b/pkgs/development/python-modules/biliass/default.nix
new file mode 100644
index 000000000000..fe2cd731a1ce
--- /dev/null
+++ b/pkgs/development/python-modules/biliass/default.nix
@@ -0,0 +1,28 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pythonOlder
+, protobuf
+}:
+
+buildPythonPackage rec {
+  pname = "biliass";
+  version = "1.3.4";
+  disabled = pythonOlder "3.6";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-kktK+6rLwYhkG7LiTBlgBbiIN8apweg4l8pJSTjKQU4=";
+  };
+
+  propagatedBuildInputs = [ protobuf ];
+
+  pythonImportsCheck = [ "biliass" ];
+
+  meta = with lib; {
+    homepage = "https://github.com/yutto-dev/biliass";
+    description = "Convert Bilibili XML/protobuf danmaku to ASS subtitle";
+    license = licenses.gpl3Only;
+    maintainers = with maintainers; [ linsui ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index d9a20d8406cd..56890eb660f8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2660,6 +2660,8 @@ with pkgs;
 
   bicon = callPackage ../applications/misc/bicon { };
 
+  biliass = with python3.pkgs; toPythonApplication biliass;
+
   bindfs = callPackage ../tools/filesystems/bindfs { };
 
   binwalk = with python3Packages; toPythonApplication binwalk;
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 0f10b43dfd67..edb98f6edf00 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1225,6 +1225,8 @@ in {
 
   bids-validator = callPackage ../development/python-modules/bids-validator { };
 
+  biliass = callPackage ../development/python-modules/biliass { };
+
   billiard = callPackage ../development/python-modules/billiard { };
 
   bimmer-connected = callPackage ../development/python-modules/bimmer-connected { };