Crato, Count of Nassau-Saarbrücken (7 April 1621 – 25 July 1642, Straelen), was the oldest son of Count William Louis of Nassau-Saarbrücken and his wife, Landgravine Anna Amalia of Baden-Durlach. He succeeded his father as Count of Nassau-Saarbrücken in 1640. As he was still a minor at the time, he stood under the regency of his mother.

Crato was killed in battle at Straelen in 1642 and was succeeded by his younger brother John Louis.