Sijtze Klaas de Waard (1796, Groningen – 17 June 1856, Haarlem) was a Dutch Mennonite teacher and minister.
He was trained at the Amsterdam Mennonite seminary and first served in Mensingeweer 1821-1826 and Akkrum 1826–1828 before serving in the Doopsgezinde kerk, Haarlem.[1] Sybrandi gave three addresses to the Haarlem society Maatschappij tot Nut van't Algemeen. From 1832 he was also a member of the Teylers First Society.