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), a state highway in Michigan
- Mercedes-Benz M115 engine
- M1 15, an electrical tram in Gothenburg, Sweden.
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