Frederick I of Baden (1249 – October 29, 1268) was margrave of Baden from October 4, 1250 until his death.
He was the only son of Margrave Herman VI of Baden and of Gertrude of Austria, the niece of Frederick II the Quarrelsome. Duke of Austria.
Frederick grew up at the Bavarian court with his friend and lover Conradin of Swabia, the young heir to the Hohenstaufen dynasty.
After his father's death in 1250, he became margrave of Baden, together with his uncle Rudolf I, and through his mother also claimant to the
Duchies of Austria and Styria.
After accompanying Conradin on his Italian expedition, Frederick passed into captivity on September 8, 1268 at Astura to the south of Anzio. Handed over to Charles of Anjou, he remained in degrading imprisonment in the Castel dell'Ovo in Naples until publicly beheaded in the Piazza del Mercato in Naples on October 29.