M115, M1 15 or M-115 may refer to:
*
M115 203 mm howitzer, a towed howitzer used by the United States Army
*
M115 bomb, a 500-pound anti-crop biological weapon
*
M-115 (Michigan highway)
M-115 is a Michigan Highway System, state trunkline highway in the Northern Michigan, northwestern part of the Lower Peninsula of Michigan, Lower Peninsula of the US state of Michigan. The highway takes a generally southeast-to-northwest direct ...
, a state highway in Michigan
*
Mercedes-Benz M115 engine
*
M1 15, an electrical tram in Gothenburg, Sweden.
{{Letter-Number Combination Disambiguation