Baldwin V, Count of Hainaut

Baldwin V of Hainaut (1150 – 17 December 1195) was count of Hainaut (1171–1195), margrave of Namur as Baldwin I (1189–1195) and count of Flanders as Baldwin VIII (1191–1195).

He was the son of Baldwin IV, Count of Hainaut. Flanders was acquired via his marriage to his widowed third cousin once removed Margaret I of Flanders, Countess of Flanders in 1169. Namur was acquired from his mother Alice of Namur. He was described as "The Count Baldwin with eyes of blue."

With Margaret, Baldwin had the following issue:

• Isabelle of Hainaut (Valenciennes, April 1170 – 15 March 1190, Paris), married king Philip II of France
• Baldwin VI of Hainaut (1171–1205), also count of Flanders and Latin Emperor
• Yolanda of Flanders (1175–1219), married Peter II of Courtenay, Latin Emperor
• Philip I, Marquis of Namur (1175–1212)
• Henry of Flanders (1176–1216), Latin Emperor
• Sybille of Hainaut (1179 – 9 January 1217), married c. 1197 Guichard IV, Sire de Beaujeu (d. 1216)
• Eustace of Hainaut (d. 1219), regent of the Kingdom of Thessalonica, married in 1209 to an unnamed daughter of Michael I Komnenos Doukas, ruler of Epirus
• Godfrey of Hainaut