OSR may refer to:
Science and technology
- Operational sex ratio, of reproductively available males to females
- On-stack replacement, used by Jikes RVM, a Java virtual machine
- Optical solar reflector, a radiator material for space craft
- OEM Service Release, a Windows 95 distribution
- Open-source robotics
Transportation
- Leoš Janáček Airport Ostrava, in Czech Republic, IATA code OSR
- Ontario Southland Railway, in Canada
- Texas State Highway OSR, in the US
Other uses
- Old School Renaissance, a movement within tabletop role-playing games
- Owasippe Scout Reservation, a Boy Scout camp in Twin Lake, Michigan, U.S.
- Orchestre de la Suisse Romande, a Swiss symphony orchestra
- Operational Situation Reports, or Einsatzgruppen reports, dispatches of the Nazi death squads
- Ohio State Reformatory, a historic US prison
- Odessa Soviet Republic, a short-lived Soviet republic
- Office of Strategic Research, a CIA intelligence analysis organization once headed by Richard Lehman
- Oilseed rape, a widely cultivated grain crop
- Overseas Service Ribbon, a US military award
See also
- OSR1, a gene
- OSR2 (gene)
- BDTH2 or OSR#1, an organosulfur compound used as a chelation agent
- OSRIC, or Old School Reference and Index Compilation, a Dungeons & Dragons retro-clone
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