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Érard 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 (Gautier II de Brienne [fr]), and Humbeline Baudemont, daughter of Andrew, lord of Baudemont (André de Baudement [fr]) and Agnès of Braine.^[2] His paternal grandparents were Érard 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. Érard II's nephew was Érard of Brienne-Ramerupt.

Before 1166, he married Agnès of Montfaucon (Agnès de Montfaucon [fr]) († 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 (Guillaume de Brienne [fr])(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]
• Ide of Brienne, who married Anseau III de Traînel [fr].

• Nicholson, Robert Lawrence (1973). Joscelyn III and the Fall of the Crusader States: 1134-1199. Brill.
• Perry, Guy (2013). John of Brienne: King of Jerusalem, Emperor of Constantinople, c.1175-1237. Cambridge University Press.
• Schenk, Jochen (2012). Templar Families: Landowning Families and the Order of the Temple in France, c.1120-1307. Cambridge University Press.