Willem Wissing, also known as William Wissing (1656 - 10 September 1687), was a Dutch portrait artist.
He was born in either Amsterdam or The Hague, and studied at The Hague under Willem Doudijns (1630 - 97) and Arnoldus van Ravestyn (1615 - 90). In 1676, he moved to England, where he studied with and assisted Peter Lely. After Lely's death in 1680, Wissing emerged as his most important pupil. Godfrey Kneller was the only contemporary portrait artist in England to rival Wissing. Wissinges royal sitters include Charles II of England, Queen Catharine of Braganza, Prince George of Denmark and James Scott, 1st Duke of Monmouth.