Jeff Tremaine (born December 8, 1966) is an American film and television producer/director, and, along with Johnny Knoxville and Spike Jonze, one of the creators of MTV's Jackass. He directed Jackass: The Movie, Jackass Number Two, and Jackass spinoff Wildboyz. Tremaine is the former editor of Big Brother Magazine and a former art director of the influential BMX magazine GO as well as a former professional BMX rider. Jeff is currently the executive producer on the MTV reality series Rob and Big.

Using his formal background in graphic design, Tremaine took a job as the art and editorial editor at Big Brother in 1992. During this time Tremaine came in contact with some of the more colorful personalities in the skateboarding world, including Dave Carnie, Chris Pontius, and later Steve-O at a Big Brother party. Tremaine also worked at Big Brother with future Jackass and Wildboyz crew members Dimitry Elyashkevich and Rick Kosick. Together with Dave Carnie and Johnny Knoxville, with material submitted by Bam Margera, the Big Brother group created a television series based on Knoxville's Big Brother video skits and Tremaine's longtime friend and music video director Spike Jonze submitted the pilot to various networks. After a bidding war between Comedy Central and MTV, Jackass was picked up by MTV with Jeff as the director.

Following the ending of the Jackass television series and a successful major motion picture, Tremaine joined Jackass alums Chris Pontius, Steve-O, Dimitry Elyashkevich, and Rick Kosick in the Jackass spin-off Wildboyz.

Also a musician, Tremaine was the vocalist for the band Milk, whose songs can be heard in Jackass: The Movie and in Jason Lee's part in Video Days, the influential skateboarding video.

He graduated from Walt Whitman High School in Bethesda, Maryland in 1985. Jeff also attended Washington University in St. Louis, Missouri, graduating in 1989. While attending Washington University, Jeff was a member in good standing of the Sigma Nu fraternity.

Along with Mark Lewman, Andy Jenkins (I) and Spike Jonze, Jeff Tremaine was an editor of Grand Royal Magazine, under the direction of Mike D and Adam Yauch and Adam Horovitz before the sad demise of Grand Royal Records and Magazine. Jeff Tremaine was also a member of the band "Milk" with 'Kelley Jenkins', Mark Lewman, Andy Jenkins (I) and R.L. Osborn. A song by Milk appears on the Jackass: The Movie (2002) soundtrack.