Frederick I (French: Ferry or Ferri) (c. 1143 – 7 April 1206) was the duke of Lorraine from 1205 to his death. He was the second son of Matthias I and Bertha (also called Judith), daughter of Frederick II, Duke of Swabia. He succeeded his brother, Simon II, who had already given him the county of Bitche in 1176 and had recognised him over the northern, germanophone half of Lorraine by the Treaty of Ribemont of 1179. Judith had wanted him to succeed to all their father's inheritance, but a three-year civil war only secured him Bitche and a half-portion.