MRO or Mro may refer to:
People Mru (disambiguation), peoples and languages also known as Mro Mary Rambaran-Olm, Canadian literary historian
Locations Hood Aerodrome (IATA code MRO), near Masterton, New Zealand Marlborough (disambiguation), some cities named Marlborough use MRO as an abbreviation Magdalena Ridge Observatory, a multi-use astronomical observatory near Socorro, New Mexico, United States Morradoo railway station, Melbourne Murchison Radio-astronomy Observatory in outback Western Australia, one of the Square Kilometre Array core sites
Companies Hokuriku Broadcasting Company, also known as MRO, a broadcasting station in Ishikawa Prefecture, Japan Marathon Oil Corporation, listed on the New York Stock Exchange as MRO Melrose Industries, listed on the London Stock Exchange as MRO MRO Software, a software company best known for its Maximo maintenance management system
Organisations Middlesex Record Office, former historical organisation, merged into the current-day London Metropolitan Archives in 1965 Midwest Reliability Organization, an electrical grid reliability organization Oriental Revolutionary Movement (Movimiento Revolucionario Oriental), a Marxist–Leninist communist party in Uruguay Mountains and Rivers Order, headquartered at the Zen Mountain Monastery in Mount Tremper, New York Macedonian Revolutionary Organization, a revolutionary national liberation organization Metsähovi Radio Observatory, an astronomical radio observatory in Kirkkonummi, Finland
Operations and techniques Maintenance, repair and operations (or overhaul), fixing or maintaining any sort of mechanical, plumbing or electrical equipment Main refinancing operations, a technique used by the European Central Bank to control the money supply Medical Review Office, the entity in which a medical professional reviews the results of a drug test. This professional may also have the title of Medical Review Officer.
Linguistics Mro language (ISO 639 code: cmr), a Kukish language of Burma Mru language (ISO 639 code: mro), a Sino-Tibetan language of Bangladesh Mro (Unicode block), the Unicode block containing characters for writing the Bangladesh Mru language
Other uses Mars Reconnaissance Orbiter, a NASA Mars probe Mini Racing Online, an arcade-style, freeware online multiplayer racing game The ISO 4217 code for the Mauritanian ouguiya, the currency of Mauritania MRO-A, MRO-D, MRO-Z; the MRO-series of RPG weapons Mitochondrion-related organelle
See also Mr. O (Canadian TV show), 1950s children's show