diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..701b63c7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/Runtime/
diff --git a/LibOS/.gitignore b/LibOS/.gitignore
new file mode 100644
index 00000000..9e073234
--- /dev/null
+++ b/LibOS/.gitignore
@@ -0,0 +1,13 @@
+# no backup files
+*~
+*.sw*
+*.backup
+
+# source only please
+*.o
+*.so
+*.a
+
+*cscope*
+
+glibc-*
diff --git a/Pal/.gitignore b/Pal/.gitignore
new file mode 100644
index 00000000..c5f3e85b
--- /dev/null
+++ b/Pal/.gitignore
@@ -0,0 +1,10 @@
+*.o
+libpal.a.backup
+libpal.so.backup
+cscope*
+*.a
+*.so
+*.run
+*.sw*
+*~
+.nfs*
diff --git a/Pal/src/.gitignore b/Pal/src/.gitignore
new file mode 100644
index 00000000..2444c805
--- /dev/null
+++ b/Pal/src/.gitignore
@@ -0,0 +1,7 @@
+/host_endian.h
+*.o
+*.so
+*.a
+pal
+pal_sec
+Makefile.Status
diff --git a/Scripts/.gitignore b/Scripts/.gitignore
new file mode 100644
index 00000000..0d20b648
--- /dev/null
+++ b/Scripts/.gitignore
@@ -0,0 +1 @@
+*.pyc