Brett Olson or Olsen may refer to:
Sportsmen Brett Olson (born 1980), American basketball forward with the 2002–03 Kansas Jayhawks men's basketball team Brett Olson (ice hockey) (born 1987), American professional ice hockey forward Brett Olson (born 1992), American basketball guard with the 2011–12, 2012–13, 2013–14 and 2014–15 Denver Pioneers men's basketball teams
Others Bret Olson, Republican nominee for the Washington House of Representatives elections, 2006 Brett Olsen, honoured for his role in Trolley Square shooting Brett Olsen (Cardfight!! Vanguard), fictional character