Cornelis Ploos van Amstel (1726, in Weesp – 1798, in Amsterdam), was an eighteenth-century Dutch painter and art collector.
According to the RKD, he was a pupil of Norbert van Bloemen and Jacobus Buys, and later became a member of the Amsterdam artist society Arte et Amicitia (De Kunstkrans).
His pupils were Christina Chalon, William V, Prince of Orange, Elisabeth van Woensel, and Hermanus Petrus Schouten.
Together with Reinier Vinkeles, Jacob Houbraken, Jan de Beijer, and Caspar Jacobsz Philips, he illustrated a new atlas of Amsterdam.
[1][3] Together with Jacob van der Schley, he made a catalog of the art in the Amsterdam City Hall, with short biographical sketches of all the artists involved.