Ole Østmo (13 September 1866 – 11 September 1923) was a Norwegian sharpshooting champion who competed in top rifle shooting sports events during late 19th century and early 20th century.
Ole Østmo participated in shooting at the 1900 Summer Olympics in Paris and won four Olympic medals—two silver and two bronze in Military Rifle categories. The silver medals were awarded in rifle standing and team categories and the bronze medals were for rifle prone and three positions categories.
The team medal in Military Rifle was the first won by a Norwegian team at the Summer Olympics.
Three years earlier, Østmo won a number of medals, including one gold, at the first World Shooting Championships held in Lyon in 1897. The gold medal was in the standing shooting event, which gave him the momentum in the combination to also take a silver behind Frank Jullien of Switzerland. Additionally, the Norwegian team won a silver.