MRR may stand for: Finance Monthly Recurring Revenue, a returning monthly income stream Market Reference Rate, e.g. Libor, Sofr 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 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