OSR

OSR can refer to:

  • OSR#1, an industrial chelation agent which had been marketed as a dietary supplement to parents of children with autism
  • Operational sex ratio, ratio of reproductively available males to females
  • Ōban Star-Racers, an animated television series
  • Ostrava-Mošnov International Airport, IATA airport code
  • Owasippe Scout Reservation, a Boy Scout camp in Twin Lake, Michigan
  • Old San Antonio Road, including the section labeled State Highway OSR (Texas)
  • Operation Summer Rains, also known as the 2006 Israel–Gaza conflict
  • Optical Solar Reflector, a radiator material for space craft
  • Open Source Resistance, a website created by Trent Reznor for the Year Zero alternate reality game
  • Ockanickon Scout Reservation, a Boy Scout resident camp in Bucks County, PA
  • Om Sai Ram, another name for Shirdi_SAI
  • Oilseed Rape
  • Oversampling Ratio
  • Old School Renaissance, a movement in table top role-playing games focusing on older games and retro-clones