The church of San Zan Degolà, which in the Venetian dialect is the abbreviation for San Giovanni Decollato, in English St John (the Baptist) beheaded, is a Byzantine-Romanesque-style church and belltower in the sestiere of Santa Croce in Venice, Italy.

A church was built on the site in the 11th century by the Venier family in gratitude and celebration for a Venetian victory, in which this family had participated, over the Genoese in Negroponte.

[1] The church contains some of its original early medieval frescoes.

Reconstructions were pursued over the centuries, and funded by noble families of Venice.

The church is now also used for Russian Orthodox services in Venice.