The United States Navy

The primary missions of submarines in the U.S. Navy are peacetime engagement, surveillance and intelligence, special operations, precision strikes, battlegroup operations, and control of the seas. The U.S. Navy operates two types: ballistic submarines and attack submarines. Ballistic submarines have only one mission: to carry and launch the nuclear Trident missile. Attack submarines have several tactical missions, including sinking ships and other subs, launching cruise missiles, gathering intelligence, and assisting in special operations. Earlier attack submarines (such as the Los Angeles class) are typically named for cities while Ohio class and later attack submarines are typically named for states. Attack submarines prior to the Los Angeles class were named for "denizens of the deep", while pre-Ohio class ballistic missile submarines were named for "famous Americans" (including foreigners with notable connections to the United States).
- Ohio class ballistic missile submarines (18 in commission, with 4 converted into guided missile submarines)
- Los Angeles class attack submarines (43 in commission, 2 in reserve, 17 decommissioned)
- Seawolf class attack submarines (3 in commission)