For the astronaut, see Michael J. Bloomfield

Mike Bloomfield (July 28, 1944 – February 15, 1981) was an American musician, guitarist and composer. Born in Chicago, Illinois, he was a session musician who became famous through his work with Bob Dylan during his first explorations into the "electric Dylan" phase. Bloomfield's sound was a major part of Dylan's sound, as featured especially on Highway 61 Revisited. His guitar style bridged blues influence with rock and folk.

From age 16 to age 21, Bloomfield made a name for himself as a guitarist on Chicago's south side, had studio session work under his belt, a recording contract with Columbia Records and had and invite to join the Paul Butterfield Blues Band. He initially played with Paul Butterfield from 1964 to 1966, formed Electric Flag in 1967 and also made an impact through his work with Al Kooper's' Super Session in 1968. He continued with solo work and back-up work from 1969 through 1980.

On the February 15, 1981 Bloomfield was found dead in San Francisco. The cause of death was ruled an accidental drug overdose.