Timothy Richard Heidecker (/ˈhaɪdɛkər/; born February 3, 1976) is an American comedian, writer, director, actor, and musician. He is best known as one half of the comedy duo Tim and Eric, along with Eric Wareheim. They are noted for creating the television shows Tom Goes to the Mayor, Tim and Eric Awesome Show, Great Job!, and Tim & Eric's Bedtime Stories.

Heidecker has also acted in several films, including Bridesmaids (2011), Tim and Eric's Billion Dollar Movie (2012), The Comedy (2012), Ant-Man and the Wasp (2018) and Us (2019). He currently co-hosts the parodic film review web series On Cinema and stars in the comedy series Decker, both alongside Gregg Turkington.