Christian Ernst of Brandenburg-Bayreuth (Bayreuth 6 August 1644 – Erlangen 20 May 1712) was a member of the House of Hohenzollern and Margrave of Brandenburg-Bayreuth.He was the only son of Erdmann August Hereditary Margrave (Erbmarkgraf) of Brandenburg-Bayreuth by his wife and first cousin Sophie of Brandenburg-Ansbach.The death of his father (6 February 1651) made Christian Ernst the new heir to the margraviate of Bayreuth.