Joseph-Marie Godefroy de Tonnancour (August 15, 1750 – November 22, 1834) was a seigneur and political figure in Lower Canada. He was born in Trois-Rivières in 1750, the son of . He was educated at the Petit Séminaire de Québec, the Collège Louis-le-Grand in Paris and Oxford University. He returned to Quebec in 1775. Godefroy de Tonnancour took part in the defence of Fort St. Johns (later Saint-Jean-sur-Richelieu) against the invading Americans but was taken prisoner. He was released in 1777. He remained a member of the local militia until 1831, becoming lieutenant-colonel in 1784. After his father's death in 1784, he inherited part of the seigneury of Yamaska, becoming sole owner in 1787. He became a justice of the peace in 1784. Godefroy de Tonnancour opposed the reform of the constituti