Baldwin V of Hainaut (1150 – December 17 1195) was count of Hainaut (c. 1120-1195), count of Flanders as Baldwin VIII (1191-1195) and margrave of Namur as Baldwin I (1189-1195). Namur was acquired by his Alice of Namur, heiress of county and Flanders via his marriage to Countess Margaret I of Flanders in 1169. With Margaret, Baldwin had the following issue:

• Isabelle of Hainaut (1170-1190), 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 of Courtenay, Latin Emperor
• Philip I, Marquis of Namur (1175-1212)
• Henry of Flanders (1176-k.1216), Latin Emperor
• Sybille (1179-1217)
• Eustace (d.1219), regent of the Kingdom of Thessalonica

See also: Counts of Hainaut family tree - Counts of Flanders family tree