Frederick II (c. 1165 – c. 1213) was the Duke of Lorraine from 7 April 1206 until his death in 1213. He was the son of Frederick I, Duke of Lorraine and Wierzchoslawa Ludmilla of Greater Poland. He succeeded his father as Duke of Lorraine upon his father's death.
Frederick married Agnes of Bar (or Thomassine, according to different genealogies) (d. 1226), daughter of Theobald I, Count of Bar. Their children were:
Theobald I, Duke of Lorraine (b. c. 1191, d. 17 February 1220), his successor
Matthias II, Duke of Lorraine (b. c. 1193, d. 9 February 1251), who succeeded Theobald I
Lorette, who married Simon II.