Michael Gabriel Fredersdorf (1708 – 12 January 1758) was the longest-standing valet and companion of Frederick II of Prussia.
The two young men met when the future Frederick II was still in prison for having attempted to run off with his former companion, Hans Hermann von Katte. At the time, Fredersdorf was four years older than the heir to the throne and served in the army, being the son of a peasant.
Both contemporaries and historians have speculated that Fredersdorf and Frederick II had a homosexual relationship, yet there is no definitive proof. Voltaire would later describe the relationship in his Memoires as, "This soldier, young, handsome, well made, and who played the flute, served to entertain the prisoner in more than one fashion."
When Frederick moved to Rheinsberg Palace with his wife in 1736, he made Fredersdorf his valet. When he ascended to the throne in 1740, he furthermore made him his private treasurer and, within less than a month, gave him the estate of Zernikow as a present. Later he also made him director of the royal theatre. When the king moved to Sanssouci, his valet's bedroom adjoined his own, still shown today. The royal gardens director Heinrich Ludwig Manger later called the chamberlain the king's chamber lover in a book of 1789.
