Cameroon, which has the ISO and FIPS country code "CM"

Chelmsford, which has the British post code "CM"

Center of mass, the point at which an object's mass seems to be concentrated

Apollo Command/Service Module (command module is one half)

Curium, a synthetic chemical element with the symbol "Cm" and atomic number 96

Copa Airlines, which has the IATA airline designator "CM"

Lazarists, also known as Congregatio Missionis, the Congregation of Priests of the Mission in the Roman Catholic Church

.cm, the country code top-level domain for Cameroon

Cooking Mama, a video game released in 2006.

The Cross Movement, a Christian hip-hop group

Connection Machine, a series of supercomputers.

C minor, a minor scale based on C, consisting of the pitches C, D, E-flat, F, G, A-flat, B-flat and C

Pitching moment coefficient, the coefficient of a moment produced by a vertical force applied at a distance forward or aft from the aerodynamic center of the airfoil

Common metre, an iambic metre consisting of four lines of length 8, 6, 8 and 6 syllables

Centimetre, a unit of length equal to one hundredth of a meter

Circular mil, a unit of area equal to the area of a circle with a diameter of one mil

Chief minister, the elected head of government of a sub-national state

Centimorgan, a unit of recombinant frequency for measuring genetic linkage

Commercial, it is used in the Japanese language as an acronym for a TV commercial

Candidate Master, an international chess title

A Member of the Order of Canada, as the post-nominal letters "C.M."

Correio da Manhã, a Portuguese daily newspaper

Computer Modern, the default family of typefaces used by the typesetting program TeX