diff --git a/projects/sentencepiece/Dockerfile b/projects/sentencepiece/Dockerfile
new file mode 100644
index 000000000..8fc2ca21d
--- /dev/null
+++ b/projects/sentencepiece/Dockerfile
@@ -0,0 +1,22 @@
+# Copyright 2020 Google Inc.
+#
+# 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
+MAINTAINER taku@google.com
+RUN apt-get update && apt-get install -y make autoconf automake libtool cmake build-essential pkg-config libgoogle-perftools-dev
+RUN git clone --depth 1 https://github.com/google/sentencepiece.git sentencepiece
+WORKDIR sentencepiece
+COPY build.sh *.cc $SRC/
diff --git a/projects/sentencepiece/build.sh b/projects/sentencepiece/build.sh
new file mode 100755
index 000000000..fee9e88f7
--- /dev/null
+++ b/projects/sentencepiece/build.sh
@@ -0,0 +1,31 @@
+#!/bin/bash -eu
+# Copyright 2020 Google Inc.
+#
+# 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.
+#
+################################################################################
+
+# build project
+mkdir build
+cd build
+cmake -DSPM_ENABLE_SHARED=ON ..
+make -j $(nproc)
+make install
+
+# build fuzzers
+for fuzzer in $(find $SRC -name '*_fuzzer.cc'); do
+  fuzz_basename=$(basename -s .cc $fuzzer)
+  $CXX $CXXFLAGS -std=c++11 -I. \
+        $fuzzers $LIB_FUZZING_ENGINE ./src/libsentencepiece.a \
+        -o $OUT/$fuzz_basename
+done
diff --git a/projects/sentencepiece/project.yaml b/projects/sentencepiece/project.yaml
new file mode 100644
index 000000000..e3295f265
--- /dev/null
+++ b/projects/sentencepiece/project.yaml
@@ -0,0 +1,9 @@
+homepage: "https://github.com/google/sentencepiece"
+language: c++
+primary_contact: "taku@google.com"
+sanitizers:
+  - address
+  - memory
+  - undefined
+architectures:
+  - x86_64
diff --git a/projects/sentencepiece/sample_encode_fuzzer.cc b/projects/sentencepiece/sample_encode_fuzzer.cc
new file mode 100644
index 000000000..7beb06fcb
--- /dev/null
+++ b/projects/sentencepiece/sample_encode_fuzzer.cc
@@ -0,0 +1,33 @@
+// Copyright 2020 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.
+
+#include <fuzzer/FuzzedDataProvider.h>
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+#include "sentencepiece_processor.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  sentencepiece::SentencePieceProcessor fuzz_sp_processor;
+  FuzzedDataProvider data_provider(data, size);
+  const int nbest_size = data_provider.ConsumeIntegral<int>();
+  const float alpha = data_provider.ConsumeFloatingPoint<float>();
+  const std::string in_string = data_provider.ConsumeRemainingBytesAsString();
+
+  fuzz_sp_processor.SampleEncodeAsSerializedProto(in_string, nbest_size, alpha);
+  return 0;
+}