Antonio Zanchi was an Italian painter of the Baroque, active mainly in Venice, but his prolific works can also be seen in Padova, Treviso, Rovigo, Verona, Vicenza, Loreto, Brescia, Milano, and Bergamo, as well as Bavaria.

He was born in Este and trained with Francesco Ruschi. His masterpieces were the canvas on the Plague of Venice painted for the Scuola di San Rocco and the ceiling on the Crowning of the Virgin Mary with St. Girolamo Miani (1703) in the Patriarchal Seminary of Venice, next to the Church of Santa Maria della Salute. He also painted a number of canvases for the Venetian church of Santa Maria del Giglio. Among his pupils were Francesco Trevisani and Antonio Molinari.