MRR

MRR may stand for:

Finance

 * Monthly recurring revenue, a returning monthly income stream
 * Market reference rate, e.g. Libor

Literature and humanities

 * Marcel Reich-Ranicki (1920–2013), German literary critic
 * T.R.S. Broughton's (1900–1993), Magistrates of the Roman Republic

Media and pop culture

 * Maximumrocknroll, a punk zine
 * My Restaurant Rules, an Australian reality show
 * "Machine Robo Rescue", a Japanese mecha anime

Online business

 * Master Resell Right

Roads
In the names of roads, Middle Ring Road:
 * Kuala Lumpur Middle Ring Road 1 (Malaysia), an urban and municipal main ring road in Kuala Lumpur
 * Kuala Lumpur Middle Ring Road 2 (Malaysia), a ring road connecting neighborhoods near Kuala Lumpur and Selangor
 * Middle Ring Road (Tianjin) (China), a system of roads partly encircling the core of Tianjin
 * Birmingham Middle ring road (A4540) in England
 * Mackay Ring Road, a proposed bypass route of Mackay

Science

 * Mean reciprocal rank, a search quality measure in information retrieval
 * Modulating retro-reflector, Free space optical communications technology

Sport

 * Manchester Road Race, a Thanksgiving Day race held annually since 1927

Other

 * José María Velasco Ibarra Airport (IATA code), an airport serving Macará, Ecuador
 * Manila Railroad Company, former name of the Philippine National Railways
 * Marine Raider Regiment, a special operations force of the United States Marine Corps
 * Multi Rolle Radio (military), a modular radio set