Sonja Mjøen (1898 – 1993) was a Norwegian actress. She was born in Christiania, a sister of Fridtjof Mjøen and Jon Lennart Mjøen,[1] and was married to journalist Axel Kielland.[2] She made her stage debut at Trondhjems nationale Scene in 1924, in Hjalmar Christensen's play Din egen herre.[3] Her film debut was in 1927. She published the books Da mor var ung in 1975 and Elsk din skjebne in 1977.[1]