(b. ca. 1620, Utrecht, d. 1693, Utrecht)
Painter, member of a Dutch family of painters, son of Adam Willaerts. In 1637 he was a master, and in 1666 the dean, of the Utrecht Guild. His mediocre coastal scenes are derived from his father's but are more loosely painted (e.g. Marine Scene with Rocky Coast and Ruin, Utrecht, Central Museum). He also followed his father in contributing marine backgrounds to Ormea's still-lifes of fish. His paintings of southern ports resemble those of his brother Abraham Willaerts.