Who were Rembrandt's contemporaries?

Answer 1

In Holland: Hals, Vermeer, de Hooch, van Ruisdael.

In Italy: Bernini the sculptor, also Poussin and Claude Lorrain who were both French.

In Spain: Ribera, Zurbaran, Murillo and Velazquez.

In Flanders: Jordaens, Rubens and van Dyck.

And many more.

Answer 2

Two of his contemporaries were Carravaggio and Velasques who he befriended whilst at the Spanish court