Jacobus Buys (19 November 1724 – 7 April 1801) was a Dutch painter and engraver.
Buys was born in Amsterdam the son of a wig-maker. He studied under Cornelis Pronk, Jacob de Wit, and Cornelis Troost, and ultimately became director of the Amsterdam Drawing Academy. He painted portraits, bas-reliefs, and tapestry, designed book-illustrations, and made copies of the works of the best masters of the seventeenth century. Buys became a member of Amsterdam's Guild of St Luke in 1750, and died in 1801.
This article incorporates text from the article "BUYS, Jacobus" in Bryan's Dictionary of Painters and Engravers by Michael Bryan, edited by Robert Edmund Graves and Sir Walter Armstrong, an 1886–1889 publication now in the public domain.