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. He was the son of Gautier II, count of Brienne (Gautier II de Brienne), and Humbeline Baudemont, daughter of Andrew, lord of Baudemont (André de Baudement) and Agnès of Braine. 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) (†after 1186), daughter of Amadeus II of Montfaucon and of Béatrice of Grandson-Joinville. Their children were: