diff --git a/R.gitignore b/R.gitignore
index 49037a0b..8eff68f7 100644
--- a/R.gitignore
+++ b/R.gitignore
@@ -2,6 +2,9 @@
 .Rhistory
 .Rapp.history
 
+# Session Data files
+.RData
+
 # Example code in package build process
 *-Ex.R