Mark Kramer (born Stephen Michael Bonner in New York City in 1958), known professionally as Kramer, is a musician, composer, record producer and founder of the New York City record label Shimmy-Disc. He was a full-time member of the bands New York Gong, Shockabilly, Bongwater and Dogbowl & Kramer, has played on tour (usually on bass guitar) with bands such as Butthole Surfers, B.A.L.L., Ween, Half Japanese and The Fugs (1984 reunion tour), and has also performed regularly with John Zorn and other improvising musicians of New York City's so-called "downtown scene" of the 1980s.

Kramer's most notable work as a producer has been with bands such as Galaxie 500 (whose entire oeuvre he produced), Low (whom he discovered and produced), Half Japanese, White Zombie, GWAR, King Missile, Danielson Famile, Will Oldham, Daniel Johnston, and Urge Overkill, including their hit cover of "Girl, You'll Be a Woman Soon".