diff --git a/tools/internal_ci/linux/pull_request/grpc_interop_alts.cfg b/tools/internal_ci/linux/pull_request/grpc_interop_alts.cfg
deleted file mode 100644
index e91a6128788..00000000000
--- a/tools/internal_ci/linux/pull_request/grpc_interop_alts.cfg
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2018 gRPC authors.
-#
-# 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.
-
-# Config file for the internal CI (in protobuf text format)
-
-# Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/linux/grpc_run_interop_tests.sh"
-timeout_mins: 60
-action {
-  define_artifacts {
-    regex: "**/sponge_log.*"
-    regex: "github/grpc/reports/**"
-  }
-}
-
-env_vars {
-  key: "RUN_TESTS_FLAGS"
-  value: "-l all -s all --use_docker --transport_security alts --internal_ci -t -j 12"
-}
diff --git a/tools/internal_ci/linux/pull_request/grpc_interop_matrix_adhoc.cfg b/tools/internal_ci/linux/pull_request/grpc_interop_matrix_adhoc.cfg
deleted file mode 100644
index 3c202fdfc43..00000000000
--- a/tools/internal_ci/linux/pull_request/grpc_interop_matrix_adhoc.cfg
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2017 gRPC authors.
-#
-# 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.
-
-# Config file for the internal CI (in protobuf text format)
-
-# Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/linux/grpc_interop_matrix.sh"
-timeout_mins: 600
-action {
-  define_artifacts {
-    regex: "**/sponge_log.xml"
-    regex: "github/grpc/reports/**"
-  }
-}
-
-env_vars {
-  key: "RUN_TESTS_FLAGS"
-  value: "--language=all --release=all --allow_flakes --report_file=sponge_log.xml"
-}
diff --git a/tools/internal_ci/linux/pull_request/grpc_interop_tocloud.cfg b/tools/internal_ci/linux/pull_request/grpc_interop_tocloud.cfg
deleted file mode 100644
index b1eb5756054..00000000000
--- a/tools/internal_ci/linux/pull_request/grpc_interop_tocloud.cfg
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2017 gRPC authors.
-#
-# 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.
-
-# Config file for the internal CI (in protobuf text format)
-
-# Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/linux/grpc_run_interop_tests.sh"
-timeout_mins: 60
-action {
-  define_artifacts {
-    regex: "**/sponge_log.*"
-    regex: "github/grpc/reports/**"
-  }
-}
-
-env_vars {
-  key: "RUN_TESTS_FLAGS"
-  value: "-l all -s all --use_docker --http2_interop --internal_ci -t -j 12"
-}
diff --git a/tools/internal_ci/linux/pull_request/grpc_interop_toprod.cfg b/tools/internal_ci/linux/pull_request/grpc_interop_toprod.cfg
deleted file mode 100644
index 636f979473b..00000000000
--- a/tools/internal_ci/linux/pull_request/grpc_interop_toprod.cfg
+++ /dev/null
@@ -1,39 +0,0 @@
-# Copyright 2017 gRPC authors.
-#
-# 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.
-
-# Config file for the internal CI (in protobuf text format)
-
-# Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/linux/grpc_run_interop_tests.sh"
-timeout_mins: 60
-action {
-  define_artifacts {
-    regex: "**/sponge_log.*"
-    regex: "github/grpc/reports/**"
-  }
-}
-
-env_vars {
-  key: "RUN_TESTS_FLAGS"
-  value: "-l all --cloud_to_prod --cloud_to_prod_auth --prod_servers default gateway_v4 --use_docker --internal_ci -t -j 12"
-}
-
-before_action {
-  fetch_keystore {
-    keystore_resource {
-      keystore_config_id: 73836
-      keyname: "interop_to_prod_tests_service_account_key"
-    }
-  }
-}