Samuel Coster (1 September 1579, Amsterdam – 1665) was a Dutch playwright. Coster was the fifth child of Adriaen Lennaertz, sexton and carpenter, and Aeltgen Jansd. By around 1605, he was a member of the Amsterdam rederijkerskamer "De Eglantier". Presumably he was helped into the society by rich friends, but then got himself to Leiden University in 1607. He began as a student of the humanities, but he graduated in 1610 as a doctor in medicine. He was appointed a physician at the Hospital on his return to Amsterdam.