RCM may refer to:
- Radar Coded Message, a form of Nexrad radar output
- Rapid Communications in Mass Spectrometry, a scientific journal
- Rassemblement des citoyens et des citoyennes de Montréal (Montreal Citizens' Movement), a municipal political party in Montreal, Quebec, Canada, that existed from 1973 to 2001
- Reciprocating Chemical Muscle, a mechanism that takes advantage of the superior energy density of chemical reactions
- Red Carpet Massacre, a Duran Duran album
- Refugee Children(s) Movement, see Kindertransport
- Regimental Corporal Major, a warrant officer appointment in the British Household Cavalry
- Regional county municipality, a territorial subdivision of Quebec
- Reliability centered maintenance, an industrial improvement approach
- Reverse Cuthill–McKee algorithm, an algorithm to reduce the bandwidth of sparse symmetric matrices
- Richmond Airport (Richmond, Queensland, Australia)
- Ring-closing metathesis, a variation on olefin metathesis
- Rotor current meter, a mechanical current meter used in Oceanography
- Royal Canadian Mint
- Royal College of Music (London, England)
- Royal College of Midwives (UK)
- Royal Conservatory of Music (Canada)
- Royal Cornwall Museum (Truro, Cornwall, UK)