John Christian of Brieg, duke of Brzeg (d. 1639)
John Christian of Brieg (Polish: Jan Chrystian; German: Johann Christian; Ohlau, 28 August 1591 – Osterode in Ostpreußen (today Ostróda), 25 December 1639), was a Duke of Brzeg–Legnica–Wołów (since 1602; with his brother as co-ruler in Legnica and Wołów until 1612; in Oława since 1605).

He was the second but eldest surviving son of Joachim Frederick, Duke of Brzeg–Oława–Legnica–Wołów, by his wife Anna Maria, daughter of Joachim Ernest, Prince of Anhalt. In his baptism, who was realized two weeks after his birth, on 14 September, he received the names of both uncles: John George of Oława and Christian of Anhalt.