The fourth season of The Hills, an American reality television series, consists of 20 episodes and was broadcast on MTV. It aired from August 18, 2008, until December 22, 2008. The season was filmed from April to November of 2008 in Los Angeles, California, with additional footage in New York City, New York; Las Vegas, Nevada; Italy; and Cabo San Lucas, Mexico. The executive producer was Liz Gateley.