John Christian of Brieg (Polish: Jan Chrystian Brzeski; German: Johann Christian von Brieg; 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.