Casimir-Amable Testard de Montigny (June 2, 1787 – January 10, 1863) was a businessman and politician in Quebec.
He represented Effingham in the Legislative Assembly of Lower Canada from 1824 to 1827.
He was born in Montreal, the son of Louis-Étienne Testard de Montigny who was the grandson of Jacques Testard de Montigny, and Louise-Archange Gamelin, dit Gaucher.