DJ Sneak (born Carlos Sosa, 1969) is a Puerto Rican house music DJ and producer raised in Chicago, Illinois. He is noted as being one of the second wave of Chicago house producers, (alongside Derrick Carter, Cajmere/Green Velvet, Gemini, and Paul Johnson) as well as a member of the vanguard of late-1990s United States house producers. In 1983, Sneak moved to the city of Chicago from Puerto Rico, where his early musical experiences and influences were rooted in salsa, meringue and Latin orchestras. In Chicago, Sneak found inspiration in underground house music, warehouse parties and "old school" mix tapes from the early pioneers, Farley Jackmaster Funk, Ralphi Rosario, Steve Hurley and local radio station shows played on WBMX.

Sneak earned his nickname rocking graffiti-tags and began working at retail stores as an airbrush artist, which kept him out of trouble and allowed him to make important local industry contacts. Development as a DJ came while working regular mobile DJ jobs and local nightclub. Sneak focused on his music production and started his independent label - Defiant Records.

In 1992, using the fundamental studio pieces, Sneak began recording tracks with a new style. In 1994, while still working at local store Gramophone Records, Sneak met Cajmere (Green Velvet) owner of Cajual and Relief Records. Cajmere released three of Sneak's catalyst tracks, which helped to bring Sneak international recognition.