Michael John Burkett (born January 16, 1967), known professionally as Fat Mike, is an American musician and producer. He was the bassist and lead vocalist for the punk rock band NOFX and the cofounder and bassist of the punk rock supergroup cover band Me First and the Gimme Gimmes. Burkett started out with his first band False Alarm in 1982. He and NOFX rhythm guitarist Eric Melvin were the only band members who remained constant in the band's lineup throughout its existence. Burkett was the owner and founder of Fat Wreck Chords.

Fat Mike plays bass with a guitar pick.

Fat Mike attended college at San Francisco State University and graduated in 1990 with a bachelor's degree in Social Science and a minor in Human Sexuality. According to the book NOFX The Hepatitis Bathtub and Other Stories, Burkett received the moniker "Fat Mike" from "one of the guys from [the band] Subculture". He is a Jewish atheist.

He credits Joe Escalante of the Vandals for introducing him to punk rock when he was 13 at a summer camp.

While attending Beverly Hills High School, Burkett began his musical career with the band False Alarm. After the band split up in 1983, he met Eric Melvin and Erik Sandin and formed the original line-up of NOFX. He has also appeared as a guest-vocalist on a number of other bands' tracks including "Peter Brady" on Screeching Weasel's 1993 album, Anthem for a New Tomorrow. Other appearances include "Beware" by Randy, "Mr. Coffee" and "Lazy" by Lagwagon. Burkett can also be heard heckling and requesting "Free Bird" at the end of the Lunachicks song, "Missed It," off their 1996 album, Pretty Ugly, which he also produced. He also appears as a guest vocalist on the Dropkick Murphys single "Going Out In Style".

Burkett recorded the Cokie the Clown EP with NOFX, playing Cokie on both the cover of the EP and the music video for the title-track, "Cokie the Clown". In the video, Burkett dresses as Cokie and puts white powder into his squirting flower, which in the song he describes as "my own special blend of X, coke, and K". Cokie then walks around Chicago squirting powder in pedestrians' faces, as chronicled in the song itself. The video was shot during the punk music festival Riot Fest.

Fat Mike has made several appearances as Cokie the Clown, but one of his most memorable was at Emo's, a popular nightclub in Austin on March 20, 2010, at the South by Southwest festival. He recounted several graphic and disturbing stories about his life, and played several songs both previously released and unreleased. He also tricked several members of the audience into drinking tequila, before showing them a video of himself filling a partially full bottle of tequila to the top with urine to shocked reactions. The stunt was later revealed as a joke on NOFX's website, which showed Fat Mike switching out the urine bottle for an untainted one before making audience members drink it. Burkett has since been banned from Emo's. However, in NOFX's autobiography Burkett claims that the urine was indeed served to the audience.

In 2015 Burkett premiered a musical titled Home Street Home which he co-wrote with Soma Snakeoil and Jeff Marx.