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. This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.