Colleen Brennan (born December 1, 1949), also known by other aliases such as Sharon Kelly, is an American porn performer and member of the XRCO Hall of Fame. She won more awards in acting categories than any other female performer of her era.

A buxom, freckled redhead, Colleen Brennan began her career starring as Sharon Kelly in several 1970s' sexploitation films produced by Harry Novak. She also made appearances in Russ Meyer's Supervixens (1975) and the Women in prison films Ilsa, She Wolf of the SS (1975) and its first sequel Ilsa, Harem Keeper of the Oil Sheiks (1976). In 1974 she appeared in an uncredited role as a stripper in the film Foxy Brown.