Gianni di Calais is a melodramma semiserio, a "semi-serious" opera in three acts by Gaetano Donizetti (1828), from a libretto by Domenico Gilardoni, based on Jean de Paris by Louis-Charles Caigniez.

The stranger turns out to be her friend, Princess Matilde, the king's daughter, fleeing to avoid having to marry the courtier Rogiero.

During her flight she had fallen into the hands of pirates, but had been rescued by the ship-owner Gianni di Calais, who later became her husband.

Gianni arrives with the sails of his ship showing images of his wife and son.

When the furious Rogiero sees her, he plans his revenge by kidnapping Gianni's and Matilde's son, but the boy is immediately rescued by Rustano.