diff --git a/R.gitignore b/R.gitignore
index 60e037a8..fcff087a 100644
--- a/R.gitignore
+++ b/R.gitignore
@@ -23,3 +23,11 @@ vignettes/*.pdf
 
 # OAuth2 token, see https://github.com/hadley/httr/releases/tag/v0.3
 .httr-oauth
+
+# knitr and R markdown default cache directories
+/*_cache/
+/cache/
+
+# Temporary files created by R markdown
+*.utf8.md
+*.knit.md