Frithjof Sælen, Sr. (5 August 1892 – 8 October 1975) was a Norwegian gymnast who competed in the 1912 Summer Olympics and in the 1920 Summer Olympics.[1]
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 represented the clubs Fredrikshalds TF and IL Norrøna.[2]
Together with Astrid Weltzin (1892–1978) he had the son Frithjof Sælen, Jr.[3]