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OLS or Ols may refer to: Oleśnica (German: Öls), Poland Operation Lone Star, Texas border operation Optical landing system, U.S. Navy landing system Order of Luthuli in Silver, a South African honour Ordinary least squares, a method used in regression analysis for estimating linear models Ottawa Linux Symposium, tech conference held annually from 1999 to 2014 Oulun Luistinseura, a Finnish multi-sports club The Sims 3: Outdoor Living Stuff, the third stuff pack to The Sims 3 Nogales International Airport (United States), Arizona, US (IATA code)