USS Columbia (SSN-771) is the 21st flight III, or Improved (688i) Los Angeles-class attack submarine of the United States Navy.

The contract to build Columbia was awarded to the Electric Boat Division of General Dynamics Corporation in Groton, Connecticut, on 14 December 1988 and her keel was laid down on 21 April 1993.

[7] In 2016, Columbia deployed on a six-month patrol in the western Pacific, making port visits at Yokosuka[8][9] and Sasebo, Japan,[10] and Guam.

Machinist's Mate Auxiliary Fireman Gabriel Romero, 22, used duty weapons issued to him as a member of the submarine's Topside Roving Patrol.

Later investigation by the Navy determined that Romero was "likely unfit" for service on a submarine and that officers and senior enlisted sailors aboard Columbia had failed to recognize and coordinate action on his deteriorating mental state.