Coert or Court Lambertus van Beyma (Harlingen, 5 February 1753 - Dronrijp, 7 September 1820), son of Julius Matthijs van Beyma and Fokel Helena van Burmania, was a public notary and auctioneer, delegate and representative of the Frisian States, leader of the Frisian patriots. He was the initiator of a Frisian coup and spent time in exile in northern France. On his return to the Netherlands in 1795, he became a delegate to the National Assembly of the newly established Batavian Republic.