The Perla-class submarines were a group of submarines built for the Italian Navy in the 1930s. They were the third sub-class of the 600 Series of submarines built by Italy and designed by Bernadis. The Iride and Onice were lent to the Nationalist side in the Spanish Civil War as the Gonzales Lopez and Aguilar Tablada respectively. They retained their Italian crews with a Spanish liaison officer. They were returned to the Italian Navy at the end of the conflict.