Joanna of Hainault (c. 1312–1374)[1] was a Duchess of Jülich by marriage to William V, Duke of Jülich.
She was the third daughter[1][2] of William I, "The Good" Count of Hainaut, and Joan of Valois.
[3] She was a younger sister of Philippa of Hainault, Queen of England, and Margaret II, Countess of Hainault.
[4] After her marriage, Joanna visited her mother Joan of Valois in January or February to May 1326, and the mother and daughter visited Joanna's sister Philipa, Queen of England, in 1329.
[1] Joanna married William V, Duke of Jülich on 26 February 1324[1] in Cologne.