Louis Crato of Nassau-Saarbrücken

Louis Crato, Count of Nassau-Saarbrücken (; 28 March 1663 in Saarbrücken – 14 February 1713 in Saarbrücken) was a German aristocrat and soldier who succeeded his father as Count of Nassau-Saarbrücken.

Early life Louis was the son of Count Gustav Adolph of Nassau-Saarbrücken and Clara Eleanor, Countess of Hohenlohe-Neuenstein. He was educated at Neuenstein with his uncle, Count Wolfgang Julius of Hohenlohe-Neuenstein, and later in Tübingen. His father was at the time a prisoner of war in France. Due to his young age, his mother initially took over the state. In 1680 they were forced to recognize the supremacy of the French King Louis XIV and to swear an oath of fealty to him. Saarbrücken and Saar Werden were incorporated into the French kingdom as part of Louis XIV's so-called reunion policy and, shortly afterwards, became part of the Province de la Sarre, founded in . Nevertheless, the old German rulers still retained a certain degree of political influence.

During his career, he was distinguished by bravery, coolness and military acumen. He took part in the siege of Luxembourg in 1684. During the Nine Years' War he served in the Netherlands Company at the Battle of Fleurus (1690) (severely wounded), the siege of Namur, the Battle of Steenkerke (1692), and the Battle of Neerwinden (1693). The French King rewarded this short spell with the Dutch army by seizing his lands. After the Treaty of Ryswick in 1697, his lands were returned to him and he became Regent. During the War of the Spanish Succession he only served in an advisory role.