Althin Caleb, (20 February 1866 - 29 January 1919) was a Swedish painter, illustrator and art teacher. Althin studied at the Royal Swedish Academy of Arts in Stockholm 1885-1894, with the exception of some years abroad studying decorative painting. He is perhaps best known as the founder of Althin's School of Painting (in Swedish: Althins målarskola) in 1896, where he was head teacher in freehand drawing. For several decades the school played an important role, not least by preparing young artists for the Academy of Arts. From 1912 he was also teacher in figure drawing at Konstfack in Stockholm.