Sonja Hagemann (6 September 1898 – 17 October 1983) was a Norwegian literary historian and literary critic, especially of children's literature. She is primarily known for the monumental Barnelitteratur i Norge (Norwegian Children's Literature I:1965; II:1970; III:1973). She was married to Otto Holmboe Hagemann (1891–1961) in 1925 and was the mother of geologist Fredrik Hagemann.