OLS can stand for:

  • IATA code for Nogales International Airport in Arizona
  • Ordinary least squares, a method used in regression analysis for estimating linear models
  • Ottawa Linux Symposium
  • Oulun Luistinseura
  • Olentangy Local School District (Delaware County, Ohio)
  • The Sims 3: Outdoor Living Stuff, the third stuff pack to The Sims 3