OMR may stand for:

• Galería OMR, a gallery in Mexico City
• Ohio Military Reserve, the state defense force of Ohio
• Old Mahabalipuram Road, a transport corridor in Chennai City
• Omani rial, by ISO 4217 currency code
• Optical mark recognition, a data-capture technology
• Optical music recognition
• Oradea International Airport (IATA code)
• Organically moderated and cooled reactor
• Outermost region, a region which is part of a European Union member state, is situated outside of Europe and is fully part of the EU
• OMR, a 2022 album by Omar Rudberg