Gammer (real name Matt Lee) is a UK hardcore and hard dance producer and DJ.

Gammer made his first appearance in the Hardcore scene during 2002 and since he has gone on to be a very successful and prolific producer, being best known for his extensive discography on the revamped Essential Platinum label. A large proportion of his tracks on the label are collaborations with the label's founder Dougal, though he has also had solo releases on his own label, Muffin Music. He has appeared with other artists such as Hixxy, and Darren Styles. Gammer is considered one of the leading artists in UK hardcore. Aside from his vinyl and digital download releases, his music appears on many albums, including the highly successful Bonkers series.