Vonck is a Dutch surname. ''Vonk'' means "spark" and refers to the work of a Smith. The surname can refer to several people:
* Elias Vonck (1605–1652), Dutch Golden Age painter
* Jan Vonck (1631–1664), Dutch Golden Age painter
* Jan Frans Vonck (1743–1792), lawyer and one of the leaders of the Brabant Revolution
* Rico Vonck (born 1987), Dutch darts player