diff --git a/.github/workflows/build-atheris.yml b/.github/workflows/build-atheris.yml
new file mode 100644
index 00000000000..9b94e0cc8bf
--- /dev/null
+++ b/.github/workflows/build-atheris.yml
@@ -0,0 +1,117 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on: https://github.com/google/atheris/blob/352d5f2/deployment/Dockerfile
+# and https://github.com/google/atheris/blob/352d5f2/run_tests.sh
+name: Build atheris wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/atheris.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-atheris.yml'
+      - 'docs/packages/atheris.yaml'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-atheris.yml'
+      - 'docs/packages/atheris.yaml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  # Upstream cuts releases without git tags, so pin the release commit: this is
+  # "Bump Atheris to 3.1.0", whose Python sources are byte-identical to the 3.1.0
+  # PyPI wheels. Update it alongside ATHERIS_VERSION.
+  ATHERIS_REF: 352d5f29d811e0b51807ca57ed5551dd08ece528
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: atheris
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build atheris ${{ matrix.version }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 90
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        python: ["cp312", "cp313", "cp314"]
+
+    env:
+      ATHERIS_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout atheris ${{ env.ATHERIS_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: google/atheris
+          ref: ${{ env.ATHERIS_REF }}
+          persist-credentials: false
+
+      - name: Build and test wheel
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # Upstream builds libFuzzer from an LLVM 16 snapshot that predates riscv64
+          # libFuzzer (added in LLVM 17); Rocky 10's compiler-rt ships it prebuilt.
+          CIBW_BEFORE_ALL: dnf install -y compiler-rt
+          CIBW_ENVIRONMENT: >-
+            LIBFUZZER_LIB=/usr/lib/clang/21/lib/riscv64-redhat-linux-gnu/libclang_rt.fuzzer_no_main.a
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          CIBW_BEFORE_BUILD: pip install setuptools pybind11
+          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
+          CIBW_TEST_REQUIRES: PyInstaller
+          CIBW_TEST_SOURCES: src
+          # pyinstaller_coverage_test.py needs a shared libpython to build a
+          # onefile executable ("Python was built without a shared library");
+          # this image's cp312/cp313/cp314 don't ship one. Every other test
+          # exercises atheris itself and stays in the loop.
+          CIBW_TEST_COMMAND: >-
+            cd src && for t in *_test.py; do
+            [ "$t" = "pyinstaller_coverage_test.py" ] && continue;
+            echo "Running test: $t" && python "$t" || exit 1; done
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: atheris-${{ env.ATHERIS_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish atheris ${{ matrix.version }}
+    needs: [setup, build_wheels]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    secrets:
+      app-private-key: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: atheris-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/atheris.yaml b/docs/packages/atheris.yaml
new file mode 100644
index 00000000000..2844e2831e8
--- /dev/null
+++ b/docs/packages/atheris.yaml
@@ -0,0 +1,5 @@
+package-name: atheris
+source-code: https://github.com/google/atheris/
+license: Apache-2.0
+versions:
+- version: 3.1.0