Jan Otto Fredagsvik (born 8 June 1947 in Frøya) is a Norwegian politician for the Labour Party.
Fredagsvik served as a deputy representative in the Norwegian Parliament from Sør-Trøndelag during the terms 1993 - 1997. From 1993 to 1996 he was brought in as a replacement representative for Gunhild Elise Øyangen, who was appointed to Brundtland's Third Cabinet.
On the local level Fredagsvik was a member of Frøya municipality council from 1971 to 2003, serving as mayor since 1987 except for his term as parliament member. He chaired the municipal party chapter in 1985 - 1987 and 2002 - 2004.