Mare Nostrum (English:Our Sea) is a 1948 Italian-Spanish drama film directed by Rafael Gil and starring María Félix, Fernando Rey and Guillermo Marín. The title refers to a Latin phrase for the Mediterranean Sea. A Spanish sailor becomes mixed up with a mysterious foreign spy at the time of the First World War. It is an adaptation of the novel of the same name by Vicente Blasco Ibáñez which had previously been turned into 1926 American silent film.