Italian ironclad Castelfidardo

Castelfidardo was the third of four Regina Maria Pia-class ironclad warships built in French shipyards for the Italian Regia Marina (Royal Navy) in the 1860s. Castelfidardo was laid down in July 1862, was launched in August 1863, and was completed in May 1864. She and her three sister ships were broadside ironclads, mounting a battery of four 203 mm (8 in) and twenty-two 164 mm (6.5 in) guns on the broadside.

Castelfidardo participated in the Battle of Lissa during the Third Italian War of Independence in 1866. She was stationed in the van of the Italian fleet, which became separated from the rest of the fleet and was not heavily engaged. Her career was limited after the war, owing to the emergence of more modern ironclads and a severe reduction in the Italian naval budget following their defeat at Lissa. She was rebuilt as a central battery ship some time after Lissa, and was modernized several more times in the 1870s and 1880s. From 1900 to 1910 she served as a training ship before being broken up for scrap.