CM1

CM1, CM-1 or cm−1 may refer to:


 * The Chelmsford postcode area
 * Bowers & Wilkins (B&W) CM1 loudspeaker
 * A primary school grade in the French educational system
 * Cooking Mama, the first game in the Cooking Mama series
 * Cake Mania, the first game in the Cake Mania series
 * The Panasonic Lumix DMC-CM1 smartphone
 * Connection Machine Model 1, a parallel computer
 * USS Baltimore (CM-1), a United States warship

In the form cm−1, it may refer to:
 * Inverse centimetre, unit of measurement: see Reciprocal length