Gregg Turkington (born November 25, 1967) is an American comedian, entertainer, actor, musician and writer. He is known for his performances as Neil Hamburger, a stand-up comedian persona he developed in the 1990s. Alongside Tim Heidecker, Turkington also stars as a fictionalized version of himself on the comedic web series On Cinema (2011–). In addition, he formed one-half of the band Zip Code Rapists and has collaborated on numerous projects with musicians including Trey Spruance (Mr. Bungle, Secret Chiefs 3).

In the 1990s, Turkington ran an independent label, Amarillo Records, which distributed his original albums and albums of other artists from the San Francisco punk scene. In 2015, he starred as a variant of the Neil Hamburger character for the feature-length drama film Entertainment, directed by Rick Alverson, and subsequently gave his first interviews as himself instead of an assumed persona. Turkington also was a regular voice actor on the Disney XD series Gravity Falls, and had minor roles in the Marvel Cinematic Universe films Ant-Man (2015) and Ant-Man and the Wasp: Quantumania (2023).

Turkington rose to prominence in the mid-1980s as the publisher of underground zine Breakfast Without Meat which brought punk respectability to "square" musical artists such as Tiny Tim, Jimmy Webb, the 101 Strings, and Richard Harris through feature articles. A frequent contributor to the zine was Derrick Bostrom of the Meat Puppets.

In the 1980s, Turkington also performed in obscure San Francisco bands such as Caroliner, Hello Kitty on Ice and Bean Church, and worked at Subterranean Records, contributing artwork and live recordings to Flipper's Public Flipper Limited Live 1980-1985 album.

In the early 1990s, Turkington operated the Amarillo Records label, which released works by many artists from San Francisco's post-punk avant-garde music scene. He was a member of The Easy Goings, Totem Pole of Losers and the Zip Code Rapists (with John Singer). He collaborated with Trey Spruance of Mr. Bungle in The Three Doctors, Faxed Head (with James Goode, Trey Spruance, and Phil Franklin), Secret Chiefs 3, Colonel Truth (with Brandan Kearney and Rebecca G. Wilson) and The Bon Larvis Band. Many of these bands appeared on 1996's Amarillo Records compilation CD, You Gan’t Boar Like An Eabla When You Work With Turkrys, along with the likes of Sun City Girls, Thinking Fellers Union Local 282, U.S. Saucer, Harvey Sid Fisher, Dieselhed, and Church of Satan founder Anton Szandor LaVey. He was also a tour manager for both Link Wray and Mr. Bungle. He contributed lead vocals to two tracks by the Secret Chiefs 3.

In the late 1990s, Turkington had abandoned Amarillo Records and all of his musical projects and moved to Melbourne, Australia, where he lived until 2003. Since then, he has written the book Warm Voices Rearranged: Anagram Record Reviews with fellow Three Doctors alumnus Brandan Kearney, also of World of Pooh, Caroliner, and Archipelago Brewing Co. He was a contributing editor to the British version of Maxim in 2005 and 2006, as well as to Johan Kugelberg's 2013 book Enjoy The Experience: Homemade Records 1958–1992.

In 2005 and 2006, after ten years of inactivity, his musical duo Zip Code Rapists did a handful of reunion shows, performing in San Francisco, Saint Paul, Minnesota, Toronto, and Montreal.

He has provided various voices for the animated series The Marvelous Misadventures of Flapjack, Aqua Teen Hunger Force, Adventure Time, Sanjay and Craig, and Gravity Falls. A parody screenplay entitled "Bicycle Built for Two" which was co-written with Tim Heidecker was published in McSweeney's #36 in December 2010.