Colin James Kilrain (born 1958)[2] is a retired United States Navy vice admiral who last served as the assistant to the chairman of the Joint Chiefs of Staff from October 20, 2021 to February 2023.

Kilrain entered active duty with the United States Navy after completing Officer Candidate School in Newport, Rhode Island, in 1985.

After his commission as an ensign, he received orders to Basic Underwater Demolition/SEAL training (BUD/S) at Naval Amphibious Base Coronado.

Kilrain earned a Master of Science degree in national resources strategy and management from the Industrial College of the Armed Forces (ICAF).

[9] He assumed command of Naval Special Warfare Group TWO (NSWG2) from 2009 to 2011, which was responsible for preparing East Coast based SEAL TEAMS for their operational deployments overseas.