Sigbjørn Bernhoft Osa (3 May 1910 – 2 February 1990) was a Norwegian fiddler and traditional folk musician.
He studied violin with Bjarne Brustad in Oslo then with the academy of Musikselskabet Harmoniens orkester in Bergen from 1929 to 1930.
His airs were often based on the Voss tradition from elder fiddlers such as Sjur Helgeland, Ola Mosafinn or his own father.
[1] He composed a concerto for hardingfele, Three Fjords, in cooperation with Geirr Tveitt.
In 1973 he recorded the track "Texas-låt" on an album with the rock group "Saft.