Other
- The Mro People, an indigenous people of Bangladesh.
- Mars Reconnaissance Orbiter (a NASA Mars probe)
- Medical Review Officer, or Medical Review Office, a term for a position or department at an organization that mandates drug testing
- The ISO 4217 code for the Mauritanian ouguiya, the currency of Mauritania
- Mini Racing Online, an arcade-style, online multiplayer racing game
- Multidrug resistant organism, a bacterium or other pathogenic organism resisting treatment by several antimicrobial agents, such as antibiotics
- Murchison Radio-astronomy Observatory in outback Western Australia, one of the SKA core sites
- Method Resolution Order in computing, as implemented in languages such as Python
- Main refinancing operations, a technique used by the European Central Bank to control the money supply
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