MM1

MM1 may refer to:


 * MM1 (US Navy rating), Machinist's mate First Class
 * MM1 (MMS), a type of Multimedia Messaging Service interface
 * Motocross Madness (1998 video game), a video game developed by Rainbow Studios
 * Midtown Madness, a 1999 racing game developed by Angel Studios
 * M/M/1 model, a single-server queuing model
 * MM/1, the Multi-Media One was a successor to the TRS-80 Color Computer
 * MM1 register, a CPU register used by the MMX extension
 * Mega Man (video game), the first game in the Mega Man video game series
 * Might and Magic Book One: The Secret of the Inner Sanctum, the first game in the Might and Magic video game series
 * Hawk MM-1, semi-automatic grenade launcher
 * Melbourne Metro, Stage 1 a proposed rail tunnel in Melbourne, Australia linking the Domain Interchange to North Melbourne railway station
 * Milan Metro Line 1 (Italian Metropolitana di Milano, linea 1), first underground rapid transit line in Milan, Italy
 * Modigliani–Miller theorem (proposition 1), a theorem on capital structure
 * Line 1 (Mumbai Metro), also known as Mumbai Metro 1