'Behave Yourself' is the seventh EP by the American indie rock band Cold War Kids. It was released on iTunes December 21, 2009 and the physical version was released on January 19, 2010.
The EP was announced on their official website on October 26, 2009. A 1-minute teaser trailer was uploaded to YouTube the same day. To promote the album, they played four shows in support of the release, with Flashy Python as a supporting act. The EP's artwork reads "These songs were recorded some time between "Loyalty" and now. They didn't belong there but kept hanging around, started trouble, made friends, and insisted they be heard". "Sermons" is a re-recording of the track "Sermons vs. the Gospel" that initially appeared on the With Our Wallets Full EP and as a hidden track at the end of their debut full-length Robbers & Cowards. The digital release debuted at number 177 on the Billboard 200.