Gillen, William or Gilliam van der Gouwen (ca. 1640, Antwerp? – in or after 1720) was a Dutch engraver.
He was a pupil of the engravers Gerard de Lairesse, Peter van Liesebetten and Pieter Rodingh. He was the engraving’s teacher of Jan Wandelaar.
A beached whale between Scheveningen and Katwijk is one of his artworks. His engraving was for a 1684 publication (Pieter Cristiaenszoon Bor: Oorspronk, Begin, en Verfolgh der Nederlandsche Oorlogen. Vol. 4), and was based on a draft by Hendrik Goltzius and an engraving by Jacob Matham.