M104 or M-104 may refer to: Sombrero Galaxy, called M104 by Messier number M104 group of galaxies HMS Walney (M104), a British warship M104 Wolverine, a military armored bridge M104 155mm Cartridge, a U.S. Army chemical artillery shell M104 (New York City bus), a New York City Bus route in Manhattan Mercedes-Benz M104 engine M-104 highway (Michigan), a road in the United States a Y-chromosome mutation, also called P22