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diff --git a/nixpkgs/pkgs/tools/audio/tts/default.nix b/nixpkgs/pkgs/tools/audio/tts/default.nix
new file mode 100644
index 000000000000..770e898f2eec
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+++ b/nixpkgs/pkgs/tools/audio/tts/default.nix
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+{ lib
+, python3Packages
+, fetchFromGitHub
+, fetchpatch
+, python3
+}:
+
+#
+# Tested in the following setup:
+#
+# TTS model:
+#   Tacotron2 DDC
+#   https://drive.google.com/drive/folders/1Y_0PcB7W6apQChXtbt6v3fAiNwVf4ER5
+# Vocoder model:
+#   Multi-Band MelGAN
+#   https://drive.google.com/drive/folders/1XeRT0q4zm5gjERJqwmX5w84pMrD00cKD
+#
+# Arrange /tmp/tts like this:
+#   scale_stats.npy
+#   tts
+#   tts/checkpoint_130000.pth.tar
+#   tts/checkpoint_130000_tf.pkl
+#   tts/checkpoint_130000_tf_2.3rc0.tflite
+#   tts/config.json
+#   tts/scale_stats.npy
+#   vocoder
+#   vocoder/checkpoint_1450000.pth.tar
+#   vocoder/checkpoint_2750000_tf.pkl
+#   vocoder/checkpoint_2750000_tf_v2.3rc.tflite
+#   vocoder/config.json
+#   vocoder/scale_stats.npy
+#
+# Start like this:
+#   cd /tmp/tts
+#   tts-server \
+#     --vocoder_config ./tts/vocoder/config.json \
+#     --vocoder_checkpoint ./tts/vocoder/checkpoint_1450000.pth.tar \
+#     --tts_config ./tts/config.json \
+#     --tts_checkpoint ./tts/checkpoint_130000.pth.tar
+#
+# For now, for deployment check the systemd unit in the pull request:
+#   https://github.com/NixOS/nixpkgs/pull/103851#issue-521121136
+#
+
+python3Packages.buildPythonApplication rec {
+  pname = "tts";
+  # until https://github.com/mozilla/TTS/issues/424 is resolved
+  # we treat released models as released versions:
+  # https://github.com/mozilla/TTS/wiki/Released-Models
+  version = "unstable-2020-06-17";
+
+  src = fetchFromGitHub {
+    owner = "mozilla";
+    repo = "TTS";
+    rev = "72a6ac54c8cfaa407fc64b660248c6a788bdd381";
+    sha256 = "1wvs264if9n5xzwi7ryxvwj1j513szp6sfj6n587xk1fphi0921f";
+  };
+
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/mozilla/TTS/commit/36fee428b9f3f4ec1914b090a2ec9d785314d9aa.patch";
+      sha256 = "sha256-pP0NxiyrsvQ0A7GEleTdT87XO08o7WxPEpb6Bmj66dc=";
+    })
+  ];
+
+  preBuild = ''
+    # numba jit tries to write to its cache directory
+    export HOME=$TMPDIR
+    sed -i -e 's!tensorflow==.*!tensorflow!' requirements.txt
+    sed -i -e 's!librosa==[^"]*!librosa!' requirements.txt setup.py
+    sed -i -e 's!unidecode==[^"]*!unidecode!' requirements.txt setup.py
+    sed -i -e 's!bokeh==[^"]*!bokeh!' requirements.txt setup.py
+    sed -i -e 's!numba==[^"]*!numba!' requirements.txt setup.py
+    # Not required for building/installation but for their development/ci workflow
+    sed -i -e '/pylint/d' requirements.txt setup.py
+    sed -i -e '/cardboardlint/d' requirements.txt setup.py
+  '';
+
+
+  propagatedBuildInputs = with python3Packages; [
+    matplotlib
+    scipy
+    pytorch
+    flask
+    attrdict
+    bokeh
+    soundfile
+    tqdm
+    librosa
+    unidecode
+    phonemizer
+    tensorboardx
+    fuzzywuzzy
+    tensorflow_2
+    inflect
+    gdown
+    pysbd
+  ];
+
+  postInstall = ''
+    cp -r TTS/server/templates/ $out/${python3.sitePackages}/TTS/server
+  '';
+
+  checkInputs = with python3Packages; [ pytestCheckHook ];
+
+  disabledTests = [
+    # RuntimeError: fft: ATen not compiled with MKL support
+    "test_torch_stft"
+    "test_stft_loss"
+    "test_multiscale_stft_loss"
+    # AssertionErrors that I feel incapable of debugging
+    "test_phoneme_to_sequence"
+    "test_text2phone"
+    "test_parametrized_gan_dataset"
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/mozilla/TTS";
+    description = "Deep learning for Text to Speech";
+    license = licenses.mpl20;
+    maintainers = with maintainers; [ hexa mic92 ];
+  };
+}