Guy Auguste de Rohan-Chabot known as the chevalier de Rohan and the comte de Chabot (18 August 1683 – 13 September 1760), often referred to as Chevalier de Rohan, was a French nobleman most notable for an altercation with Voltaire.
Guy Auguste married twice, first Yvonne Sylvie Breil de Rays (1712 – 15 July 1740) on 7 February 1729, with whom he fathered two sons, Louis Antoine Auguste and Charles. After his wife's death he married Mary Apolonia Scolastica Stafford-Howard (17 February 1721 – 16 May 1769) on 25 May 1744.
Guy-Auguste is remembered for an altercation with the young Voltaire in 1725, in which both men insulted each other. He then hired some men to assault Voltaire while he watched from his carriage. The aristocratic Rohan family obtained a lettre de cachet from French King Louis XV and used this warrant to force Voltaire first into imprisonment in the Bastille and then into exile in Great Britain.