8M or 8-M may refer to: * 8 m, or 8 metres * Maxair (aviation), IATA code * Myanmar Airways International, IATA code * Grigorovich M-8, a variation of the Grigorovich M-5 * GCR Class 8M, a class of British 2-8-0 steam locomotive * 8M, a model of Bensen B-8 * Smena 8M, a model of Smena (camera) * VO-8M, see VMA-231 * International Women's Day, shortening of Spanish: 8 de marzo, lit. 'March 8'