diff --git a/BUILD b/BUILD
index 6b8ecff3..a188155e 100644
--- a/BUILD
+++ b/BUILD
@@ -72,6 +72,7 @@ proto_library(
     name = "v3_protos",
     visibility = ["//visibility:public"],
     deps = [
+        "//contrib/envoy/extensions/filters/http/language/v3alpha:pkg",
         "//contrib/envoy/extensions/filters/http/squash/v3:pkg",
         "//contrib/envoy/extensions/filters/http/sxg/v3alpha:pkg",
         "//contrib/envoy/extensions/filters/network/kafka_broker/v3:pkg",
diff --git a/contrib/envoy/extensions/filters/http/language/v3alpha/BUILD b/contrib/envoy/extensions/filters/http/language/v3alpha/BUILD
new file mode 100644
index 00000000..ee92fb65
--- /dev/null
+++ b/contrib/envoy/extensions/filters/http/language/v3alpha/BUILD
@@ -0,0 +1,9 @@
+# DO NOT EDIT. This file is generated by tools/proto_format/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = ["@com_github_cncf_udpa//udpa/annotations:pkg"],
+)
diff --git a/contrib/envoy/extensions/filters/http/language/v3alpha/language.proto b/contrib/envoy/extensions/filters/http/language/v3alpha/language.proto
new file mode 100644
index 00000000..7f45d5e6
--- /dev/null
+++ b/contrib/envoy/extensions/filters/http/language/v3alpha/language.proto
@@ -0,0 +1,36 @@
+syntax = "proto3";
+
+package envoy.extensions.filters.http.language.v3alpha;
+
+import "udpa/annotations/status.proto";
+import "validate/validate.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.filters.http.language.v3alpha";
+option java_outer_classname = "LanguageProto";
+option java_multiple_files = true;
+option go_package = "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/language/v3alpha";
+option (udpa.annotations.file_status).package_version_status = ACTIVE;
+
+// [#protodoc-title: Language]
+// Language :ref:`configuration overview <config_http_filters_language>`.
+// [#extension: envoy.filters.http.language]
+
+// Language detection filter config.
+message Language {
+  // The default language to be used as a fallback.
+  // The value will be included in the list of the supported languages.
+  //
+  // See https://unicode-org.github.io/icu/userguide/locale/
+  string default_language = 1 [(validate.rules).string = {min_len: 2}];
+
+  // The set of supported languages. There is no order priority.
+  // The order will be determined by the Accept-Language header priority list
+  // of the client.
+  //
+  // See https://unicode-org.github.io/icu/userguide/locale/
+  repeated string supported_languages = 2 [(validate.rules).repeated = {
+    min_items: 1
+    unique: true
+    items {string {min_len: 2}}
+  }];
+}
diff --git a/versioning/BUILD b/versioning/BUILD
index 59e08033..ad1b8e81 100644
--- a/versioning/BUILD
+++ b/versioning/BUILD
@@ -9,6 +9,7 @@ proto_library(
     name = "active_protos",
     visibility = ["//visibility:public"],
     deps = [
+        "//contrib/envoy/extensions/filters/http/language/v3alpha:pkg",
         "//contrib/envoy/extensions/filters/http/squash/v3:pkg",
         "//contrib/envoy/extensions/filters/http/sxg/v3alpha:pkg",
         "//contrib/envoy/extensions/filters/network/kafka_broker/v3:pkg",