Frederick Henry Louis (German: Friedrich Heinrich Ludwig) (18 January 1726 – 3 August 1802), commonly known as Henry (Heinrich), was a Prince of Prussia and the younger brother of Frederick the Great. He also served as a general and statesman, leading Prussian armies in the Silesian Wars and the Seven Years' War, having never lost a battle in the latter. In 1786, he was suggested as a candidate for a monarch for the United States.

Born in Berlin, Henry was the 13th child of King Frederick William I of Prussia and Princess Sophia Dorothea of Hanover. Henry's conflicts with his older brother, King Frederick II of Prussia, are almost legendary. Although remarkably similar in appearance and personality (both were fond of the arts and French literature, and both were exceptional military commanders) Henry resented being in Frederick's shadow. Nonetheless, he loyally served as one of his brother's top generals throughout Frederick's reign. Henry tended to be less aggressive than the King in battle; although he never won a victory of the scale of Rossbach or Leuthen (two of Frederick's greatest victories), his caution served him well as he was never defeated on the battlefield.

When he was only 14, Henry was appointed as Colonel of the 35th Infanterieregiment by Frederick after he became king in 1740, leading Henry to participate in the Silesian Wars. Henry lived in the shadow of his older brother and sometimes criticized the king's military strategies and foreign policies, although in later years the brothers became closer. In 1753 he published his memoirs under the pseudonym "Maréchal Gessler".

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