Erard II of Brienne (died 1191) was count of Brienne from 1161 to 1191, and a French general during the Third Crusade, most notably at the Siege of Acre.^[1] He was the son of Gautier II, count of Brienne, and Humbeline Baudemont, daughter of Andrew, lord of Baudemont and Agnes of Braine.^[2] His paternal grandparents were Erard I, Count of Brienne and Alix de Roucy. During this siege he saw his brother André of Brienne die on 4 October 1189, before being killed himself on 8 February 1191. Erard II's nephew was Erard of Brienne-Ramerupt.

Before 1166 he married Agnès of Montfaucon († after 1186),^[3] daughter of Amadeus II of Montfaucon and of Béatrice of Grandson-Joinville. Their children were:

• Walter III of Brienne (died 1205) count of Brienne and claimant to the throne of Sicily.^[3]
• William of Brienne (died 1199) lord of Pacy-sur-Armançon, married Eustachie of Courtenay, daughter of Peter I of Courtenay and Elisabeth of Courtenay.^[3]
• John of Brienne (1170–1237), king of Jerusalem (1210–1225), then emperor of Constantinople (1231–1237).^[3]
• Andrew^[3]
• Ida of Brienne who married Ernoul of Reynel lord of Pierrefitte.^[3]