SSN-AUKUS

	Rendering of SSN-AUKUS submarine (BAE Systems)
Class overview
Name	SSN-AUKUS, SSN-A
Builders	BAE Systems Submarines, Barrow-in-Furness (United Kingdom); TBD, Osborne Naval Shipyard (Australia);
Operators	Royal Navy; Royal Australian Navy;
Preceded by	Astute class (RN); Collins class (RAN);
Built	Late 2020s (United Kingdom); Late 2030s (Australia);
In service	Late 2030s (United Kingdom); Early 2040s (Australia);
Planned	TBD (United Kingdom); 5 (Australia);
General characteristics (conceptual)
Type	Nuclear attack submarine
Propulsion	PWR nuclear reactor
Sensors and ; processing systems	Evolved AN/BYG-1 Combat Management System
Armament	Torpedoes and missiles

The SSN-AUKUS, also known as the SSN-A, is a planned class of nuclear-powered fleet submarine (SSN) intended to enter service with the United Kingdom's Royal Navy in the late 2030s and Royal Australian Navy in the 2040s. The class will replace the UK's Astute class and Australia's Collins class submarines.

The UK commenced an Astute class replacement project in 2018, which was later named the Submersible Ship Nuclear Replacement (SSNR). The ongoing SSNR design was renamed SSN-AUKUS in March 2023, under the 2021 AUKUS trilateral security partnership, when Australia joined the programme and additional US technology was incorporated into the design.

Australia plans to build five SSN-AUKUS submarines in addition to acquiring three nuclear-powered Virginia class submarines from the United States.

The class will be powered by Rolls-Royce's pressurised water reactors (PWR).

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