List of United States Naval reactors is a comprehensive list of all naval reactors designed, built, or used by the United States Navy.

Reactor designations

Each nuclear reactor design is given a three-character designation consisting of a letter representing the type of ship the reactor is intended for, a consecutive generation number, and a letter indicating the reactor's designer.

Ship types:

• "A" – aircraft carrier
• "C" – cruiser
• "D" – destroyer
• "S" – submarine

Contracted designers:

• "B" – Bechtel
• "C" – Combustion Engineering
• "G" – General Electric
• "W" – Westinghouse

Nuclear reactors of the United States Navy

Naval reactors of the United States Navy, listed alphabetically by ship type.

Aircraft carrier reactors

• A1W reactor
  • land-based prototype for USS Enterprise (CVN-65); located at Naval Reactors Facility
• A2W reactor
  • USS Enterprise (CVN-65)
• A3W reactor
  • designed for USS John F. Kennedy (CV-67), but never installed
• A4W reactor
  • Nimitz-class aircraft carriers
• A1B reactor
  • Gerald R. Ford-class aircraft carriers

Cruiser reactors

• C1W reactor
  • Long Beach-class cruiser

Destroyer reactors

• D1G reactor
  • land-based prototype for Bainbridge-class cruiser; located at the Kesselring site
• D2G reactor
  • Bainbridge-class cruiser
  • Truxtun-class cruiser
  • California-class cruiser
  • Virginia-class cruiser

Submarine reactors

• NR-1 reactor
  • one-of-a-kind reactor built for the U.S. Navy research submarine NR-1
• S1C reactor
  • land-based prototype for USS Tullibee (SSN-597); located at Windsor, Connecticut
• S1G reactor
  • land-based prototype for USS Seawolf (SSN-575); located at Kesselring site
• S1W reactor
  • land-based prototype for USS Nautilus (SSN-571); located at Naval Reactors Facility
• S2C reactor
  • USS Tullibee (SSN-597)
• S2G reactor
  • USS Seawolf (SSN-575)
• S2W reactor
  • USS Nautilus (SSN-571)
• S2Wa reactor
  • replacement reactor for USS Seawolf (SSN-575)
• S3G reactor
  • land-based prototype for USS Triton (SSN-586); located at Kesselring site
• S3W reactor
  • USS Skate (SSN-578)
  • USS Sargo (SSN-583)
  • USS Halibut (SSGN-587)
• S4G reactor
  • USS Triton (SSRN-586)
• S4W reactor
  • USS Swordfish (SSN-579)
  • USS Seadragon (SSN-584)
• S5G reactor
  • A land-based prototype located at Naval Reactors Facility, and
  • USS Narwhal (SSN-671)
• S5W reactor
  • Skipjack-class submarine (SSN-585 class)
  • George Washington-class submarine (SSBN-598 class)
  • Thresher/Permit-class submarine (SSN-593/SSN-594 class)
  • Ethan Allen-class submarine (SSBN-608 class)
  • Lafayette-class submarine (SSBN-616 class)
  • James Madison-class submarine (SSBN-627 class)
  • Benjamin Franklin-class submarine (SSBN-640 class)
  • Sturgeon-class submarine (SSN-637 class)
  • USS Parche (SSN-683)
  • USS Glenard P. Lipscomb (SSN-685)
• S6G reactor
  • Los Angeles-class submarine (SSN-688 class)
• S6W reactor
  • Seawolf-class submarine (SSN-21 class)
• S7G reactor
  • land-based prototype (Modifications and Additions to a Reactor Facility or "MARF") located at the Kesselring site
• S8G reactor
  • Ohio-class submarines (SSBN-726 class)
• S9G reactor
  • Virginia-class submarine (SSN-774 class)
• S1B reactor
  • Columbia-class submarine (SSBN-826 class)