Jean III de Werchin (1374 – 25 October 1415), called the Good (le Bon), was a knight errant and poet from the County of Hainaut in the Holy Roman Empire. In 1383 his father died and he inherited the baronies of Werchin, Walincourt and Cysoing, as well as the hereditary office of seneschal of Hainaut, which had been in his family since about 1234.