John IV, Count of Roucy

John IV (born between 1260 and 1269, died 1302), of the House of Pierrepont, was count of Roucy and lord of Pierrepont, succeeding his father John III in 1282 or 1285. By his wife Jeanne of Dreux, countess of Braine, he also held Braine and Rochefort.

In 1302 he joined the war against Flanders, falling in battle near Mons-en-Pévèle. He left three children, John V, Marie and Béatrix.