Baldwin VI (I) of Mons Count of Flanders And Hainaut
- Born: 1030, Flanders, Belgium
- Marriage: Richilde
- Died: 17 Jul 1070 at age 40
- Buried: Abbey de Hasnon
Baldwin VI of Flanders (1030 - July 17, 1070) was briefly Count of Flanders, from 1067 to 1070. He was also (as Baldwin I) count of Hainaut from 1051 to 1070.
He was the eldest son of Baldwin V of Flanders and Adèle Capet, a daughter of king Robert II of France.
In 1051 he married Richilde, Countess of Mons and Hainaut, widow of count Hermann of Mons. By this marriage Flanders took control of the county Hainaut (at that moment still a conglomerate of the county of Mons, the margraviate of Valenciennes and the southern county out of the Brabant shire).
Baldwin's early death left Flanders and Hainaut in the hands of his young son Arnulf III, with Richilde as regent. The countship was soon usurped by Baldwin's brother Robert the Frisian, who became count Robert I of Flanders. The young Arnulf III was killed the next year at the Battle of Cassel and Baldwin's younger son eventually became Baldwin II of Hainaut.
Baldwin married Richilde, daughter of Regnier V and Unknown.