San Marziale is a church building in the sestiere or neighborhood of Cannaregio in Venice.
The church dates to 1133. The present church was rebuilt in 1693-1714 and reconsecrated in 1721. It contains works by Antonio Vassilacchi (L'Aliense), Domenico Cresti (il Passignano); Tintoretto, and Giulia Lama. The second altarpiece on the right is the Apotheosis of Saint Martial with Saints Peter and Paul. The Scuola del Santissimo Sacramento commissioned the altar (1691-1704) in the chancel attributed to Tommaso Ruer. The elaborate marble main altar is dedicated to the Blessed Virgin of the Graces. The icon is a copy of the original image supposedly sculpted in Rimini in 1286 by a shepherd named Rustico and miraculously brought to Venice. The ceiling frescoes are by Sebastiano Ricci and depict The arrival of the icon of the Madonna in Venice, Apotheosis of Saint Marziale, Rustico observing angels sculpt the statue of the Madonna, and finally God the Father in Glory.