Giovanni Querini was a 13th-century Venetian nobleman and administrator.
[1] In 1225, he was ducal councillor, and in 1226 he took up service under the Latin Emperor, Robert of Courtenay, though not before taking an oath to not do so against Venetian interests.
[1] He was thus a natural choice to become Venetian Podestà of Constantinople, likely after Emperor Robert died in January 1228.
[2] His term of office was nevertheless brief, as he was replaced in spring 1229 by Romeo Querini.
[3] He is finally attested as ducal councillor in Venice in 1231.