Jean-Baptiste van Loo (14 January 1684 - 19 December 1745) was a French subject and portrait painter.
 
He was born in Aix-en-Provence, and was instructed in art by his father Louis-Abraham van Loo, son of Jacob van Loo. Having at an early age executed several pictures for the decoration of the church and public buildings at Aix, he was employed on similar work at Toulon, which he was obliged to leave during the siege of 1707.
 
He was patronized by the prince of Carignan, who sent him to Rome, where he studied under Benedetto Luti. He was much employed painting for churches in Rome, and in particular executed a greatly praised Scourging of Christ for the church of Santa Maria in Monticelli. At Turin he painted Charles Emmanuel II, Duke of Savoy and several members of his court. Then, moving to Paris, where he was elected a member of the Académie Royale de Peinture et de Sculpture, he executed various altar-pieces and restored the works of Francesco Primaticcio at Fontainebleau.