Line M

Line M may refer to:


 * Line M, a train line in New York
 * Line M, a train line in Boston
 * Line M, a metro line in Tokyo
 * Line M, a train line in San Francisco
 * Line M, a metro line in Osaka
 * Line M, a train line in Tokyo
 * Line M, a subway line in Nagoya
 * Line M rabbit, a breed of rabbit