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TheCount of Rennes was originally the ruler of theRomano-Frankishcivitas ofRennes. From the middle of the ninth century these counts wereBretons with close ties to theDuchy of Brittany, which they often vied to rule. From 990 the Counts of Rennes were usually Dukes of Brittany. In 1203 the county was integrated into the ducaldemesne. The Count of Rennes was a title held by theHouse of Rennes.^{[citation needed]}

• ???–876Gurwant, also Duke from 874
• 876–888Judicael
• 888–896Berengar II of Neustria
• 896–903unknown
• 903–953Judicael Berengar
• 958–992Conan Ithe Crooked, also Duke from 990
• 992–1008Geoffrey I, also Duke
• 1008–1040Alan I, also Duke; granted the Countship of Penthievre to his brother Eudes, thereby founding the Cadet Branch of the House of Rennes. Ruled withOdo, Count of Penthièvre until 1035.^{[citation needed]}
• 1040–1066Conan II, also Duke
• 1066–1082Geoffrey IIGrenonat
• 1066–1072Hawise (in opposition to Geoffrey II), also Duchess
• 1072–1084Hoel I (in opposition to Geoffrey II from 1066), also Duke from 1066
• 1084–1112Alan IIFergant, also Duke
• 1112–1148Conan IIIthe Fat, also Duke
• 1148–1156Hoel II
• 1156–1166Conan IVthe Young, also Duke until 1166
• 1166–1181HenryCurtmantle, as guardian of Constance
• 1181–1186Geoffrey III, Count of Rennes and Duke of Brittanyjure uxoris as Geoffrey II
• 1166–1201Constance, also Duchess from 1166
• 1196–1203Arthur, also Duke

The County of Rennes was merged into the Ducal crown of Brittany, and subsequently the crown of France, through Constance's descendants.

• Comté de Rennes

• Counts of Rennes

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