Antoine Casavant (October 20, 1826 – July 18, 1892) was a farmer and political figure in Quebec. He represented Bagot in the Legislative Assembly of Quebec from 1881 to 1886 as a Conservative. His name also appears as Antoine Casavant dit Ladébauche.

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He was born in Saint-Hyacinthe, Lower Canada, the son of Antoine Casavant dit Ladébauche and Marie Benoît, and was educated at the Séminaire de Saint-Hyacinthe. Casavant served as a captain in the militia, a justice of the peace and a commissioner for the trial of minor causes. He was also president of the agricultural society for Bagot County and a member of the Quebec agricultural council. He helped found a beet sugar plant at Farnham. He was married twice: to Rosalie Piedalue in 1850 and to Marie-Hermine Vachon in 1868. Casavant served on the municipal council for Saint-Dominique. He ran unsuccessfully for the Saint-Hyacinthe seat in the Quebec assembly in 1878 and 1879. Casavant died in Saint-Dominique at the age of 65.