Guyard is a surname. Notable people with the surname include:
Hubert Guyard, French cyclist Marie Guyart (1599–1672), Ursuline nun of the French order Michel Guyard (1936–2021), French Catholic bishop Sarah Guyard-Guillot (1981–2013), French acrobat and aerialist
See also Villeneuve-la-Guyard, commune in the Yonne department in Bourgogne-Franche-Comté in north-central France Guyart