Acronym
- MARC standards, data format used for library cataloging,
- MARC Train, regional commuter rail system in Maryland; Washington, D.C.; and eastern West Virginia (U.S.)
- MARC (archive), computer-related mailing list archive
- M/A/R/C Research, a marketing research and consulting firm
- Massachusetts Animal Rights Coalition, nonprofit volunteer-run animal rights organization based in Massachusetts
- Mid-America Regional Council, the Council of Governments and the Metropolitan Planning Organization for the bistate Kansas City region
- Midwest Association for Race Cars, American stock car racing organization that was the precursor to the Automobile Racing Club of America (ARCA)
- Movimiento Agrario Revolucionario del Campesinado Boliviano
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