PT Boats were motor torpedo boats ("PT", for "Patrol Torpedo"). They were small, fast ships used by the United States Navy in World War II to attack larger surface ships. The PT boat squadrons were nicknamed "the mosquito fleet". They were exceedingly nimble, relatively expendable to the larger fleet, and carried torpedoes that featured a remarkable destruction-to weight ratio. John F. Kennedy famously served on one of these. His boat was run over and sliced in two by an enemy destroyer. Navies often used destroyers to combat these cheap but dangerous surface craft.
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| Aircraft carriers |
- Aircraft carrier
- Escort carrier
- Helicopter carrier
- Submarine aircraft carrier
- Balloon carrier
- Seaplane tender
- Light aircraft carrier
- Amphibious assault ship
- Aircraft cruiser
- Anti-submarine warfare carrier
- Fighter catapult ship
- CAM ship
- Merchant aircraft carrier
- Supercarrier
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| Battleships | |
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| Cruisers |
- Cruiser
- Armored cruiser
- Battlecruiser
- Aircraft cruiser
- Protected cruiser
- Unprotected cruiser
- Heavy cruiser
- Light cruiser
- Flight deck cruiser
- Merchant raider
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| Escort |
- Destroyer
- Guided missile destroyer
- Destroyer escort
- Frigate
- Aviso
- Kaibokan
- Sloop
- Convoy rescue ship
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| Transport |
- Troopship
- Amphibious warfare ship
- Dock landing ship
- Landing Ship Tank
- Landing Ship Vehicle
- Landing Ship Infantry
- Landing Ship Heavy
- Landing Ship Medium
- Landing Ship Support, Large
- Amphibious transport dock
- Attack transport
- Landing craft
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| Patrol craft |
- Patrol boat
- Corvette
- Submarine chaser
- Armed boarding steamer
- Ocean boarding vessel
- Armed yacht
- Naval trawler
- Naval drifter
- Gunboat
- Torpedo boat
- Missile boat
- Fast attack craft (MTB, E-boat, MAS, MGB, PT boat)
- Steam Gun Boat
- Harbour Defence Motor Launch
- Coastal Motor Boat
- Q-ship
- Motor Launch
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| Mine warfare |
- Mine planter
- Minelayer
- Minesweeper
- Destroyer minesweeper
- Minehunter
- Mine-countermeasure vessel
- Danlayer
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| Command and support |
- Command ship
- Fast combat support ship
- Combat stores ship
- General stores issue ship
- Ammunition ship
- Oiler
- Collier
- Hospital ship
- Auxiliary repair dock
- Crane vessel
- Auxiliary ship
- Destroyer tender
- Submarine tender
- Depot ship
- Dispatch boat
- Net laying ship
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| Submarines | |
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| Miscellaneous |
- Monitor
- Breastwork monitor
- Barracks ship
- Training ship
- Guard ship
- Littoral combat ship
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