Erard of Bar, (French: Érard de Bar) was a monk by 1292 and then seigneur de Pierrepont, Meurthe-et-Moselle et d'Ancerville by 1302. Erard was one of eight sons born to Theobald II, Count of Bar^[1] and his wife, Jeanne de Toucy.

He married Isabella of Lorraine (d. 12 December 1353),^[1] daughter of Theobald II, Duke of Lorraine, and Isabelle de Rumigny; they had had six children. Erard died in 1335 at Pierrepont, France.

• Thiebauld de Bar, Seigneur de Pierrepont (b. c 1314 - d. c 1354) married in 1340 to Marie de Namur, daughter of John I, Marquis of Namur and Marie of Artois; had two children.
• Marie de Bar (d. c 1380) married Jean de Dampierre, Seigneur de Saint Dizier.
• Ferri de Bar, Seigneur de Norroy (d. 9 Nov 1368) also Canon at Reims Cathedral in 1362, Canon at Liège and Cambrai Cathedrals in 1363. Later elected Bishop of Liège in 1364.
• Jean de Bar, Seigneur de Pierrepont et St. Amand-en-Puisaye (d. 1366) married before 1353 to Catherine de Châtillon-en-Bazois. Jean and his wife had one child: Jeanne de Bar (d. 25 Sep 1361).
• Renaud de Bar, Seigneur de Pierrefitte (d. between 18 Jan 1354 - 1 Apr 1359) had one child.
• Henriette de Bar, Dame de Saint-Amand et de Puisaye (d. after 29 Mar 1380) married before 11 Apr 1359 to Heinrich, Graf von Lützelstein.