Lieutenant General Guy Carleton Swan III (born January 28, 1954)[2] is a retired United States Army officer.

After graduation and initial officer training, he served in Korea as a tank platoon leader in the 2nd Infantry Division's 1st Battalion, 72nd Armor.

Swan served at the Pentagon in Washington, D.C., from June 1998 to August 2000 as the assistant deputy director for strategy and policy (J-5) for the Joint Chiefs of Staff.

Prior to his assignment to USNORTHCOM, Swan was the commanding general of the Military District of Washington (CG/MDW) and Joint Force Headquarters National Capital Region (JFHQ-NCR) from July 21, 2005 through June 5, 2007.

[5] On July 31, 2019, President Trump announced his intention to appoint Swan to be a Member of the Board of Visitors to the United States Military Academy.