Casimir Reuterskiöld (14 September 1883 – 25 December 1953) was a Swedish sport shooter who competed in the 1920 Summer Olympics.
He won a silver medal in the team free pistol competition and finished eighth individually.Reuterskiöld was a career military officer.
At the time of the 1920 Olympics he held a rank of captain and was one of the most experienced shooters in the Swedish pistol team, having won two bronze medals at the 1913 World Championships.