Oscar Gustaf Björck ( January 1860 – December 1929) was a Swedish painter and a professor at the Royal Swedish Academy of Arts. He y settled in Stockholm in 1888 where he concentrated on portraits. Björck's earliest portraits were influenced by Georg von Rosen and his pictures from Skagen reflected the influence of Danish artists, especially Peder Severin Krøyer. In many of his characteristic works, he depicted the Swedish middle class of his times.
Björck was encouraged to go to Skagen in 1882 by P.S. Krøyer whom he had met in Paris and for whom he showed great admiration. He immediately became attached to the artists' community there, especially Michael Ancher, his wife Anna and Holger Drachmann. It was not just the Skagen landscape that attracted him but equally the warmth and hospitality of the artists themselves. Björck spent several summers there, completing some of his best paintings under the influence of Krøyer and the French Naturalism movement.