Martin Harry Greenberg is an American speculative fiction anthologist and writer. Greenberg took a doctorate in Political Science in 1969, and has taught at the University of Wisconsin - Green Bay since 1975. His first anthology was Political Science Fiction (1974, with Patricia Warrick), intended to be used as a teaching guide, then continuing with a sequence of educational anthology titles under the series name Through Science Fiction. In the late 70s Greenberg began partnering with Joseph D. Olander on more conventional SF anthologies.
He shared the 2005 Prometheus Special Award with Mark Tier for the anthologies Give Me Liberty and Visions of Liberty.