USS Illinois (SSN-786) is a Virginia-class nuclear-powered attack submarine in the United States Navy.

She was built by the Electric Boat division of General Dynamics, the third of their Block III variants which feature a revised bow and technology from the converted sub-class of Ohio guided missile submarines (SSGN).

[10] The contract for the build was awarded on 22 December 2008 to Huntington Ingalls Industries in partnership with Electric Boat, and construction commenced with the keel laying ceremony on 2 June 2014, at their yard in Groton, Connecticut.

[12] She was delivered to the Navy on 27 August 2016 and commissioned in a ceremony at Naval Submarine Base New London on 29 October 2016.

[16] The official ship's crest was designed by Christopher Durdle of Roseville, IL and accepted by the Navy at an unveiling ceremony at the Union League Club of Chicago on 2 April 2015.