Ali Sami Yen (20 May 1888 – 29 July 1951) was a Turkish football player, coach and manager. He was the founder and first president of Galatasaray S.K.
When he was a student at Galatasaray High School, he and his colleagues decided to start a football club. On October 1905, they started Galatasaray S.K. and he became founding member number 1.