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