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
 
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