List of counts of Hainaut
House of Reginar
The County of Hainaut was then divided between the counties of Mons and Valenciennes.
Counts of Mons
Counts and Margraves of Valenciennes
Valenciennes and Mons are once again reunited in a consolidated County of Hainaut.
House of Flanders
- Baldwin I (r. 1051–1070), also Count of Flanders
- Arnulf I (r. 1070–1071), son of Baldwin VI, also Count of Flanders
- Baldwin II (r. 1071–1098), son of Baldwin I
- Baldwin III (r. 1098–1120), son of Baldwin II
- Baldwin IV (r. 1120–1171), son of Baldin III
- Baldwin V (r. 1171–1195), son of Baldwin IV, also Count of Flanders from 1191
- Baldwin VI (r. 1195–1205), son of Baldwin V, also Count of Flanders and Latin Emperor of Constantinople
- Joan (r. 1205–1244), daughter of Baldwin VI, also Countess of Flanders
- Margaret I (r. 1244–1253), daughter of Baldwin VI, also Countess of Flanders, married first to Bouchard IV of Avesnes and then William of Dampierre
- The Counties of Flanders and Hainaut are claimed by Margaret's sons, the half-brothers John I of Avesnes and William III of Dampierre in the War of the Succession of Flanders and Hainault. In 1246, King Louis IX of France awards Hainaut to John, but Margaret refuses to hand over the government but was forced to do so in 1254 by John and the German anti-king William II, Count of Holland.
House of Avesnes
House of Flanders
- Margaret I (r. 1257–1280), resumed control after John I's death
House of Avesnes
House of Bavaria
- William III (r. 1345–1388), son of Margaret II and Louis IV
- Margaret returned in 1350 in opposition to her son and held Hainaut until 1356.
- Albert I, (Regent since 1358, ruled as count 1388–1404)
- William IV (r. 1404–1417), son of Albert I
- Jacqueline (r. 1417–1432), daughter of William IV
- Jacqueline was opposed by her uncle John, Duke of Bavaria-Straubing, son of Count Albert I in a war of succession. John's claims devolved upon Philip III, Duke of Burgundy, a nephew of William IV, whose mother had been the sister of William. In 1432 he forced Jacqueline to abdicate from Hainaut and Holland in his favour.
House of Burgundy
House of Habsburg
Charles II proclaimed the Pragmatic Sanction of 1549 eternally uniting Hainaut with the other lordships of the Low Countries in a personal union. When the Habsburg empire was divided among the heirs of Charles V, the Low Countries, including Hainaut, went to Philip II of Spain, of the Spanish branch of the House of Habsburg.
- Philip III (r. 1555–1598), son of Charles III, also King of Spain
- Isabella Clara Eugenia (r. 1598–1621), daughter of Philip II,
- Philip IV (r. 1621–1665), grandson of Philip III, also King of Spain
- Charles III (r. 1665–1700), son of Philip IV, also King of Spain
Between 1706 and 1714 the Low Countries were invaded by the English and the Dutch during the War of the Spanish Succession. The fief was claimed by the House of Habsburg and the House of Bourbon. In 1714, the Treaty of Rastatt settled the succession and the County of Hainaut went to the Austrian branch of the House of Habsburg.
- Charles IV (r. 1714–1740), great grandson of Philip III, als Holy Roman Emperor (elect)
- Mary Theresa (r. 1740–1780), daughter of Charles IV, married Francis I, Holy Roman Emperor
- Joseph I (r. 1780–1790), son of Maria Theresa and Francis I, also Holy Roman Emperor
- Leopold (r. 1790–1792), son of Maria Theresa and Francis I, also Holy Roman Emperor
- Francis II (r. 1792–1835), son of Leopold II, also Holy Roman Emperor
The title was factually abolished in the aftermath of the French revolution and the annexation of Flanders by France in 1795. Although, the title remained officially claimed by the descendants of Leopold II until the reign of Charles I of Austria.