Com

Com or COM may refer to:

Computing

 * COM (hardware interface), a serial port interface on IBM PC-compatible computers
 * COM file, or .com file, short for "command", a file extension for an executable file in MS-DOS
 * .com, an Internet top-level domain, originally short for "commercial"
 * Component Object Model, a Microsoft software interface technology
 * Computer-on-module, a type of single-board computer

Transport

 * Comair (United States), an airline which was a wholly owned subsidiary of Delta Air Lines by ICAO airline designator
 * Commonwealth MRT station, a Mass Rapid Transit station in Singapore by MRT station abbreviation

Other

 * Calcium oxalate monohydrate, the mineral whewellite and a common component of kidney stones
 * COM (manga magazine)
 * Cốm, green rice dish in Vietnam
 * Common rail (electricity), a common path of currents in an electronic circuit, often for the ground
 * Center of mass
 * Center-of-momentum frame
 * Coma Berenices (constellation), standard astronomical abbreviation
 * Comoros, ISO 3166-1 alpha-3 country code
 * College of Marin, a community college in Marin County, California
 * College of the Mainland, a community college in Texas City, Texas
 * Collectivité d'outre-mer, a French overseas collectivity, or first-order administrative division
 * Concerned Officers Movement, anti-war organization
 * Commander of the Order of Merit of the Police Forces, Canadian decoration post-nominal letters
 * Either of two figures named Com in the Book of Mormon: an early Jaredite king, son of Coriantum; and a late Jaredite king
 * Como, a city and comune in Lombardy, Italy, in Romansh language