"Ship classes" refers to the common practice to build multiple ships using a same or similar design. The design is then called a "class", and the class is often named after the name of the 1st built ship of the class, or the initial design's code name. Ships built under the same class are then called "sister ships".
Fast Battleship (FBB)
Kongou-class
Yamato-class
Bismarck-class
Conte di Cavour-class
Vittorio Veneto-class
North Carolina-class
South Dakota-class
Iowa-class
Richelieu-class
Gangut-class
Battleship (BB)
Fusou-class
Ise-class
Nagato-class
Yamato-class
Conte di Cavour-class
Colorado-class
Queen Elizabeth-class
Nelson-class
Aviation Battleship (BBV)
Fusou-class
Ise-class
Yamato-class
Standard Aircraft Carrier (CV)
Akagi-class
Kaga-class
Souryuu-class
Hiryuu-class
Shoukaku-class
Unryuu-class
Graf Zeppelin-class
Aquila-class
Lexington-class
Ranger-class
Yorktown-class
Essex-class
Ark Royal-class
Armored Aircraft Carrier (CVB)
Shoukaku-class
Taihou-class
Lexington-class
Illustrious-class
Light Aircraft Carrier (CVL)
Houshou-class
Ryuujou-class
Ryuuhou-class
Shouhou-class
Hiyou-class
Chitose-class
Mogami-class
Kasuga Maru-class (Nitta Maru-class)
Converted Merchant Aircraft Carrier (Nitta Maru-class)
Taiyou-class
Independence-class
Casablanca-class
Heavy Cruiser (CA)
Furutaka-class
Aoba-class
Myoukou-class
Takao-class
Mogami-class
Tone-class
Admiral Hipper-class
Zara-class
Northampton-class
New Orleans-class
Aviation Cruiser (CAV)
Mogami-class
Tone-class
Light Cruiser (CL)
Tenryuu-class
Kuma-class
Nagara-class
Sendai-class
Yuubari-class
Agano-class
Ooyodo-class
Duca degli Abruzzi-class
Brooklyn-class
St. Louis-class
Atlanta-class
Town-class
Gotland-class
De Ruyter-class
Perth-class (Amphion-class)
Torpedo Cruiser (CLT)
Kuma-class
Training Cruiser (CT)
??-class
Katori-class
Destroyer (DD)
Kamikaze-class
Mutsuki-class
Fubuki-class
Ayanami-class
Akatsuki-class
Hatsuharu-class
Shiratsuyu-class
Asashio-class
Kagerou-class
Yuugumo-class
Akizuki-class
Shimakaze-class
Matsu-class
Type 1934-class
Maestrale-class
Fletcher-class
John C. Butler-class
J-class
Tashkent-class
Submarine (SS)
Kaidai VI-class
Junsen 3-class
Junsen Type B
Junsen Type C-class
Junsen Type B Kai Ni
I-201-class
Ro-series
I-504
Type 3 Submergence Transport Vehicle
UIT-25
Type IXC U-boat
Guglielmo Marconi-class
Gato-class
Salmon-class
Submarine Aircraft Carrier (SSV)
Type AM-class
I-400-class
Junsen 3-class
Junsen Type B
Junsen Type B Kai Ni