diff --git a/google-cloud-spanner/acceptance/spanner/client/params/pgoid_test.rb b/google-cloud-spanner/acceptance/spanner/client/params/pgoid_test.rb
new file mode 100644
index 00000000..0fdaf03f
--- /dev/null
+++ b/google-cloud-spanner/acceptance/spanner/client/params/pgoid_test.rb
@@ -0,0 +1,28 @@
+# Copyright 2023 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
+#
+#     https://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.
+
+require "spanner_helper"
+
+describe "Spanner Client", :params, :bool, :spanner do
+  let(:db) { spanner_pg_client }
+
+  it "queries and returns a PG.OID parameter" do
+    skip if emulator_enabled?
+    results = db.execute_query "SELECT $1 AS value", params: { p1: 123 }, types: { p1: :PG_OID }
+
+    _(results).must_be_kind_of Google::Cloud::Spanner::Results
+    _(results.fields[:value]).must_equal :INT64
+    _(results.rows.first[:value]).must_equal 123
+  end
+end
diff --git a/google-cloud-spanner/acceptance/spanner/client/types/pgoid_test.rb b/google-cloud-spanner/acceptance/spanner/client/types/pgoid_test.rb
new file mode 100644
index 00000000..fad47580
--- /dev/null
+++ b/google-cloud-spanner/acceptance/spanner/client/types/pgoid_test.rb
@@ -0,0 +1,29 @@
+# Copyright 2023 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
+#
+#     https://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.
+
+require "spanner_helper"
+
+describe "Spanner Client", :types, :oid, :spanner do
+  let(:db) { spanner_pg_client }
+  let(:table_name) { "stuffs" }
+
+  it "queries pg.oid" do
+    skip if emulator_enabled?
+    results = db.execute_sql "select 123::oid as value"
+
+    _(results).must_be_kind_of Google::Cloud::Spanner::Results
+    _(results.fields.to_h).must_equal({ value: :INT64 })
+    _(results.rows.first.to_h).must_equal({ value: 123 })
+  end
+end
diff --git a/google-cloud-spanner/lib/google/cloud/spanner/convert.rb b/google-cloud-spanner/lib/google/cloud/spanner/convert.rb
index 2f86eb69..65d39789 100644
--- a/google-cloud-spanner/lib/google/cloud/spanner/convert.rb
+++ b/google-cloud-spanner/lib/google/cloud/spanner/convert.rb
@@ -183,7 +183,9 @@ def grpc_type_for_field field
             when :PG_NUMERIC
               V1::Type.new(code: :NUMERIC, type_annotation: :PG_NUMERIC)
             when :PG_JSONB
-              V1::Type.new(code: :JSON, type_annotation: :PG_JSONB)  
+              V1::Type.new(code: :JSON, type_annotation: :PG_JSONB)
+            when :PG_OID
+              V1::Type.new(code: :INT64, type_annotation: :PG_OID)
             else
               V1::Type.new(code: field)
             end