Prince Frederick Emil August of Schleswig-Holstein-Sonderburg-Augustenburg (Kiel, 23 August 1800 – Beirut, 2 July 1865), usually simply known by just his first name, Frederick, Prince of Noër, was a prince of the House of Schleswig-Holstein-Sonderburg-Augustenburg and a cadet-line descendant of the Danish royal house.

He was the second and youngest son of Louise Auguste of Denmark and Frederik Christian II, Duke of Schleswig-Holstein-Sonderburg-Augustenburg. As such, he was close to succeed in the Danish throne. He was the brother-in-law of King Christian VIII. And nephew of King Frederik VI. His elder brother, Christian August II, succeed in 1814 as the Duke of Schleswig-Holstein-Sonderburg-Augustenburg.

After his morganatic union, he renounced the rights of succession to House of Augustenburg. It isn't known if this included his children from his first equal marriage. He was created Prince of Noer or Nør by Emperor Franz Joseph of Austria afterwards.

Prince Frederick died 1865 at Beirut.

Frederick married on 17 September 1829, at Augustenburg, his second cousin Countess Henriette of Danneskjold-Samsøe (9 May 1806 - 10 September 1858) who was a Danish noblewoman and great-great-great granddaughter of Christian V of Denmark, belonging to an illegitimate branch of the House of Oldenburg. His brother had married his wife's elder sister nine year previous. They had four children:

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