(July 21, 1577, London - April 4, 1664, Utrecht ) was a Dutch Golden Age painter.
Willaerts (occasionally Willarts, Willers) was born in London to Flemish parents who had fled from Antwerp for religious reasons. By 1585 the family lived in Leiden. From 1597 until his death, Adam lived in Utrecht, where he became a member of the Guild of St. Luke in 1611, and subsequently rose to dean in 1620. His sons Cornelis, Abraham, and Isaac followed in his footsteps.
He was known as a painter of river and canal pieces, coastal landscapes, fish-markets, processions, and genre scenes. He also painted villages and marine battle scenes.