Léonard Godefroy de Tonnancour (November 6, 1793 – January 29, 1867) was a political figure in Lower Canada.
He inherited part of the seigneuries of Yamaska and Saint-François, as well as property in Acton County, in 1834.
Godefroy de Tonnancour was elected to the Legislative Assembly of Lower Canada for Yamaska in an 1832 by-election; he was reelected in 1834.
In 1835, he had married Marguerite, the daughter of Benjamin-Hyacinthe-Martin Cherrier, surveyor and former member of the legislative assembly.
His older brother Marie-Joseph became co-seigneur after the death of their father and was a member of the legislative assembly.