diff --git a/.gitignore b/.gitignore
index db5a8c4305..4731d5ba99 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,6 +37,12 @@ local.properties
 proguard.cfg
 proguard-project.txt
 
+# Bazel
+bazel-bin
+bazel-genfiles
+bazel-out
+bazel-testlogs
+
 # Other
 .DS_Store
 cmake-build-debug
@@ -66,3 +72,6 @@ extensions/cronet/jniLibs/*
 extensions/cronet/libs/*
 !extensions/cronet/libs/README.md
 
+# Cast receiver
+cast_receiver_app/external-js
+cast_receiver_app/bazel-cast_receiver_app
diff --git a/.hgignore b/.hgignore
index f7c3656f65..36d3268005 100644
--- a/.hgignore
+++ b/.hgignore
@@ -44,6 +44,12 @@ local.properties
 proguard.cfg
 proguard-project.txt
 
+# Bazel
+bazel-bin
+bazel-genfiles
+bazel-out
+bazel-testlogs
+
 # Other
 .DS_Store
 cmake-build-debug
@@ -69,3 +75,7 @@ extensions/cronet/jniLibs/*
 !extensions/cronet/jniLibs/README.md
 extensions/cronet/libs/*
 !extensions/cronet/libs/README.md
+
+# Cast receiver
+cast_receiver_app/external-js
+cast_receiver_app/bazel-cast_receiver_app