Karl Gustaf Torsten Sjögren (//; Swedish: [ˈɧœˈɡrɪən]; 30 January 1896 – 27 July 1974) was a Swedish psychiatrist and geneticist. He was born in Södertälje and died in Gothenburg.
Sjögren–Larsson syndrome is named for him (along with Tage Larsson). 
Marinesco–Sjögren syndrome is also named for him.
He was also involved in the characterization of juvenile neuronal ceroid lipofuscinosis.
He should not be confused with Henrik Sjögren, for whom Sjögren's syndrome is named.
Torsten Sjögren was professor of psychiatry at Karolinska Institutet from 1945 to 1961. He was elected a member of the Royal Swedish Academy of Sciences in 1951.