Affondatore was an ironclad warship of the Regia Marina (Italian Royal Navy), built in the 1860s. Her name translates as "Sinker". She was an armoured turret-ship built by Harrison, Millwall, London for the Italian navy. Construction commenced in 1863; the ship, despite being incomplete, was brought to Italy a few days before the Third Italian War of Independence. Eight boilers powered one steam engine, generating 2,700 HP and propelling her at 12 knots. She carried 474 tonnes of coal, giving her a range of 1,647 miles at 10 knots, adequate for the time's Mediterranean engagements.