The Osmaniye class was a group of four ironclad warships built for the Ottoman Navy in the 1860s. The class comprised Osmaniye, the lead ship, Aziziye, Orhaniye, and Mahmudiye. They were the first vessels of the type to be built for the Ottoman Empire; all four were built in Great Britain, the first three by Robert Napier and Sons and the fourth by Thames Iron Works. The ships were broadside ironclads, carrying a battery of fourteen 203 mm (8 in) Armstrong guns and ten 36-pounder Armstrong guns in a bank of guns on each broadside.