Jean Robert II Tronchin (3 October 1710, Geneva - 11 March 1793, Rolle), also known as Tronchin-Boissier (Boissier was his wife's name), Attorney General, member of the State Council of Geneva was the son of Jean Tronchin (1672–1761). He busied himself on a friendly basis in Voltaire's interests and maintained a correspondence on artistic subjects with Denis Diderot.

Cabinetmakers of the period gave his name to a species of pretty light reading table with a rack for drawing ("tables à la Tronchin"). He was the first cousin of François Tronchin [fr] (1704-1798) and Jean Robert I Tronchin (1702-1788), and the distant cousin of Theodore Tronchin, all three of whom were respectively Voltaire's friend, banker and doctor.

Works

• 1764: Deux discours sur l'esprit de parti prononcés par M. Tronchin (...) dans l'assemblée du Conseil des Deux-Cent de la République de Genève au commencement de l'année 1762 et au commencement de l'année 1764, Neufchâtel.
• 1765: Lettres écrites de la campagne, Geneva