Louis Otto, Prince of Salm

Louis Otto, Prince of Salm (24 October 1674 – 23 November 1738) was the Count of Salm-Salm from 1710, the only son of the Imperial chamberlain (Reichskämmerer) Charles Theodore, Prince of Salm (1645–1710) and Countess Palatine Luise Maria of Simmern (1647-1679).

Louis (Ludwig) Otto married Princess Albertine Johannette of Nassau-Hadamar (5 July 1679 – 11 June 1716) on 20 July 1700. She was a great-granddaughter of John VI, Count of Nassau-Dillenburg, brother of William the Silent. The couple had three children:

Ludwig Otto died in Anholt Castle in 1738. His death ended his branch (the altfürstliche line) of the House of Salm, since Ludwig Otto had no son as heir.