MSY or msy can mean:
- Maximum sustainable yield
- IATA airport code for Louis Armstrong New Orleans International Airport
- Merseyside, county in England, Chapman code
- The Mount School, York, United Kingdom
- Motor sailing yacht, a ship prefix for a yacht that can use a motor for propulsion and also sail
- Mulayam Singh Yadav
- Million Species Years, a measurement of Background extinction rate
This disambiguation page lists articles associated with the title MSY.
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