USS C-4 (SS-15) one of five C-class submarines built for the United States Navy in the first decade of the 20th century.

[1] For surface running, they were powered by two 240-brake-horsepower (179 kW) Craig gasoline engines, each driving one propeller shaft.

Assigned first to the Atlantic Torpedo Fleet, and later to the Atlantic Submarine Flotilla, Bonita plied east coast waters until May 1913, when she cleared Norfolk, Virginia for Guantánamo Bay, Cuba.

Her tactical exercises and development operations continued here and from Cristobal, Panama Canal Zone, where she reported on 12 December 1913.

Laid up at Coco Solo Canal Zone from 12 November 1918, C-4 was decommissioned there on 15 August 1919, and sold on 13 April 1920.