diff --git a/recipes/recipes_emscripten/bliss/build.sh b/recipes/recipes_emscripten/bliss/build.sh
new file mode 100644
index 0000000000..3492d0ca3c
--- /dev/null
+++ b/recipes/recipes_emscripten/bliss/build.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -euxo pipefail
+
+export CFLAGS="-I$PREFIX/include $(echo "${CFLAGS:-}" | sed -E 's/-march=[^ ]+//g; s/-mtune=[^ ]+//g')"
+export CXXFLAGS="-I$PREFIX/include $(echo "${CXXFLAGS:-}" | sed -E 's/-march=[^ ]+//g; s/-mtune=[^ ]+//g')"
+export LDFLAGS="-L$PREFIX/lib ${LDFLAGS:-}"
+
+emcmake cmake -S . -B build \
+    -DCMAKE_INSTALL_PREFIX=$PREFIX \
+    -DCMAKE_PREFIX_PATH=$PREFIX \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DUSE_GMP=ON \
+    -DGMP_LIBRARIES=$PREFIX/lib/libgmp.a \
+    -DBUILD_SHARED_LIBS=OFF
+
+cd build
+emmake make -j${CPU_COUNT:-1}
+
+mkdir -p $PREFIX/lib
+mkdir -p $PREFIX/include/bliss
+mkdir -p $PREFIX/bin
+
+cp libbliss.a $PREFIX/lib/
+cp libbliss_static.a $PREFIX/lib/ || true
+
+cp ../src/*.hh $PREFIX/include/bliss/
+
+cp bliss.js $PREFIX/bin/
+cp bliss.wasm $PREFIX/bin/
\ No newline at end of file
diff --git a/recipes/recipes_emscripten/bliss/recipe.yaml b/recipes/recipes_emscripten/bliss/recipe.yaml
new file mode 100644
index 0000000000..3345931091
--- /dev/null
+++ b/recipes/recipes_emscripten/bliss/recipe.yaml
@@ -0,0 +1,44 @@
+context:
+  name: bliss
+  version: '0.77'
+
+package:
+  name: ${{ name }}
+  version: ${{ version }}
+
+source:
+  url: https://users.aalto.fi/~tjunttil/bliss/downloads/bliss-${{ version }}.zip
+  sha256: acc8b98034f30fad24c897f365abd866c13d9f1bb207e398d0caf136875972a4
+
+build:
+  number: 0
+
+requirements:
+  build:
+  - autoconf
+  - automake
+  - libtool
+  - make
+  - ${{ compiler("c") }}
+  - ${{ compiler('cxx') }}
+  - pkg-config
+  - autoconf-archive
+  host:
+  - gmp
+
+tests:
+  - package_contents:
+      files:
+        - bin/bliss.js
+        - lib/libbliss.a
+        - include/bliss/graph.hh
+
+about:
+  license: LGPL-3.0-only AND GPL-3.0-only
+  license_file: COPYING
+  summary: Combinatorial matrix recognition
+  homepage: https://users.aalto.fi/~tjunttil/bliss/index.html
+
+extra:
+  recipe-maintainers:
+  - mkoeppe
diff --git a/recipes/recipes_emscripten/passagemath-bliss/recipe.yaml b/recipes/recipes_emscripten/passagemath-bliss/recipe.yaml
new file mode 100644
index 0000000000..87e62f8dbe
--- /dev/null
+++ b/recipes/recipes_emscripten/passagemath-bliss/recipe.yaml
@@ -0,0 +1,65 @@
+context:
+  version: 10.8.7
+
+package:
+  name: passagemath-bliss
+  version: ${{ version }}
+
+source:
+- url: https://pypi.org/packages/source/p/passagemath-bliss/passagemath_bliss-${{ version }}.tar.gz
+  sha256: 1c26e1496c11452ce0da64a08356f73ca3ce03e120b781a6f1a6ca19abcea45c
+
+build:
+  script: ${{ PYTHON }} -m pip install .
+  number: 0
+
+requirements:
+  build:
+  - python
+  - crossenv >=1.2
+  - cross-python_emscripten-wasm32
+  - ${{ compiler("c") }}
+  - ${{ compiler("cxx") }}
+  - pip
+  - passagemath-setup
+  - passagemath-environment
+  - cython
+  - cysignals
+  - pkgconfig
+  - passagemath-abi == ${{ version }}
+  host:
+  - python
+  - bliss
+  run:
+  - python
+  - cysignals
+
+tests:
+- script: pytester
+  files:
+    recipe:
+    - test_passagemath_bliss.py
+  requirements:
+    build:
+    - pytester
+    run:
+    - pytester-run
+    - passagemath-graphs
+    - passagemath-repl
+
+about:
+  license: GPL-2.0-or-later
+  license_file: README.rst
+  summary: 'passagemath: Graph (iso/auto)morphisms with bliss'
+  description: |
+    Distribution of a part of the Sage library.
+    It provides a Cython interface to the bliss library for the purpose
+    of computing graph (iso/auto)morphisms.
+
+extra:
+  emscripten_tests:
+    python:
+      pytest_files:
+      - test_passagemath_bliss.py
+  recipe-maintainers:
+  - mkoeppe
diff --git a/recipes/recipes_emscripten/passagemath-bliss/test_passagemath_bliss.py b/recipes/recipes_emscripten/passagemath-bliss/test_passagemath_bliss.py
new file mode 100644
index 0000000000..2e49e56ed5
--- /dev/null
+++ b/recipes/recipes_emscripten/passagemath-bliss/test_passagemath_bliss.py
@@ -0,0 +1,5 @@
+import pytest
+
+
+def test_import_passagemath_bliss():
+    import passagemath_bliss