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 Second World War. It is an adaptation of the by Vicente Blasco Ibáñez which had previously been turned into a 1926 American silent film.