Camp Casey (Korean: 캠프 케이시) is a U.S. military base in Dongducheon (also sometimes spelled Tongduchŏn or TDC), South Korea, 40 miles (64 km) north of Seoul, South Korea. Camp Casey was named in 1952 after Major Hugh Boyd Casey, who was killed in a plane crash near the camp site during the Korean War. Camp Casey is one of several U.S. Army bases in South Korea near the Korean Demilitarized Zone (DMZ). Camp Casey, Camp Hovey, and neighboring Camp Castle and Camp Mobile hold the main armor, 7th Division of a bridging engineer company as well, and mechanized infantry elements of the 2nd Infantry Division (United States) in South Korea. Camp Castle has been largely abandoned, with only a warehouse remaining. Camp Mobile was severely damaged during a flood in July 2011, and has been abandoned except for an unmanned aerial vehicle (UAV) company. Camp Casey spans 3,500 acres (14 km2) and is occupied by 6,300 military personnel and 2,500 civilians. There are plans for the relocation of most of the 2nd Infantry Division to Camp Humphreys which are underway with the latest estimate for completion being 2022. The Field Artillery Battalion remains for now at Camp Casey, while Camp Hovey is to be closed.

Camp Casey was home to several of the main combat units of the Second Infantry Division.