RCU may refer to:
Science and technology Read-copy-update, a computer operating system synchronization mechanism Remote concentrator unit in telephony Organocopper complexes (RCu), in reactions of organocopper reagents
Organizations Radio Club Uruguayo Rogue Credit Union, a federal credit union in Medford, Oregon Regional Cadet Units of the Australian Army Cadets Regional Coordinating Unit in the Northwest Pacific Action Plan Regional Crime Unit of the Hong Kong Police Force
Other uses Rocket City United, an American soccer team RC Unterföhring, a German rugby union club Las Higueras Airport (IATA code), Argentina A remote control unit