|Was||Gymnast Athlete Artistic gymnast|
|Birth||15 January 1894, Bergen, Norway|
|Death||21 March 1938, Bergen, Norway (aged 44 years)|
Jacob Opdahl (15 January 1894 – 20 March 1938) was a Norwegian gymnast who competed in the 1912 Summer Olympics and in the 1920 Summer Olympics. In 1912 he was part of the Norwegian team, which won the gold medal in the gymnastics men's team, free system event. Eight years later he won a silver medal again as member of the Norwegian gymnastics team. He was born and died in Bergen, was a brother of Nils Opdahl, and represented Bergens TF.