Timothy Richard Heidecker (; born February 3, 1976) is an American comedian, writer, director, actor, and musician. Along with Eric Wareheim, he is a member of the comedy duo Tim & Eric.

As an actor, Heidecker's filmography includes roles in Bridesmaids (2011), Tim and Eric's Billion Dollar Movie (2012), The Comedy (2012), Ant-Man and the Wasp (2018), and Us (2019). He currently hosts the parodic film review web series On Cinema, with guest star Gregg Turkington, and hosts a weekly call-in show, Office Hours Live with Tim Heidecker, with DJ Douggpound and Vic Berger. Heidecker is also a singer-songwriter, having released a blend of comedy rock and more earnest folk rock across an eight-album solo discography. His latest album, Slipping Away, was released in October of 2024.