diff --git a/projects/xnu/Dockerfile b/projects/xnu/Dockerfile
new file mode 100644
index 000000000..ab69648a6
--- /dev/null
+++ b/projects/xnu/Dockerfile
@@ -0,0 +1,37 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder
+
+RUN apt-get update && apt-get install -y \
+  autoconf \
+  automake \
+  libtool \
+  ninja-build
+
+# Install Protobuf for C++ as the version in the base-builder repos may
+# be outdated.
+RUN curl -LO https://github.com/protocolbuffers/protobuf/releases/download/v3.18.1/protobuf-cpp-3.18.1.tar.gz
+RUN tar xf protobuf-cpp-3.18.1.tar.gz
+WORKDIR $SRC/protobuf-3.18.1
+# Build statically
+RUN ./configure --disable-shared
+RUN make -j $(nproc)
+RUN make install
+
+WORKDIR $SRC
+RUN git clone --depth 1 https://github.com/googleprojectzero/SockFuzzer.git
+COPY build.sh $SRC
diff --git a/projects/xnu/build.sh b/projects/xnu/build.sh
new file mode 100755
index 000000000..715e32bd2
--- /dev/null
+++ b/projects/xnu/build.sh
@@ -0,0 +1,24 @@
+#!/bin/bash -eu
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+mkdir build
+cd build
+
+cmake -GNinja $SRC/SockFuzzer
+ninja
+
+cp $SRC/build/net_fuzzer $OUT
diff --git a/projects/xnu/project.yaml b/projects/xnu/project.yaml
new file mode 100644
index 000000000..e0d883189
--- /dev/null
+++ b/projects/xnu/project.yaml
@@ -0,0 +1,9 @@
+homepage: "https://opensource.apple.com/"
+language: "c"
+primary_contact: "nedwill@google.com"
+main_repo: "https://github.com/googleprojectzero/SockFuzzer"
+fuzzing_engines:
+  - libfuzzer
+  - honggfuzz
+sanitizers:
+  - address