Franz Frederick Anton, Duke of Saxe-Coburg-Saalfeld (Coburg, 15 July 1750 – Coburg, 9 December 1806), is a duke of Saxe-Coburg-Saalfeld.
He is a patrilineal ancestor of Elizabeth II of the United Kingdom, Albert II of Belgium and Simeon B. Sakskoburggotski, former tsar (Simeon II) and prime minister of Bulgaria.