Gregg Michael Gillis (born October 26, 1981), better known by his stage name Girl Talk, is an American musician specialising in mashups and digital sampling. Gillis has released five LPs on the record label Illegal Art and EPs on 333 and 12 Apostles.

He produces mashup-style remixes, in which he uses often a dozen or more unauthorised samples from different songs to create a mashup. The New York Times Magazine has called his releases "a lawsuit waiting to happen," a criticism that Gillis has attributed to mainstream media that wants "to create controversy where it doesn't really exist," citing fair use as a legal backbone for his sampling practices.

He has given different explanations for the origin of his stage name, once saying that it alluded to a Jim Morrison poem. and once saying that it alluded to an early Merzbow side project. Most recently, he attributed the name to Tad, the early 1990s SubPop band, based in Seattle.