(b. 1621, Antwerpen, d. 1690, Antwerpen)
Flemish painter (also spelt Gysels). He began his training in 1641, when he was already 20, with Antwerp painter Jan Boots. Houbraken assumed he was also apprenticed to Jan Brueghel the Younger, whose diary describes a painting completed in 1638 as a 'small wild boar somewhat touched up by Gys'. But it seems highly doubtful that, as van der Sanden claimed, 'Gys' refers to Pieter Gysels. In 1649 or 1650 he became a master in Antwerp's Guild of St Luke. It is not known whether he took on any pupils. On 13 November 1650 he married Joanna Huybrecht, who bore him six children.