Fort Indiantown Gap, also referred to as "The Gap" or "FIG", is a census-designated place and National Guard Training Center primarily located in Lebanon County, Pennsylvania, in the United States. A portion of the installation is located in eastern Dauphin County. It is located adjacent to Interstate 81, 23 miles northeast of Harrisburg, just north of the northern terminus of Pennsylvania Route 934 at I-81's Exit 85.
The installation is an active National Guard Training Center and serves as headquarters for the Pennsylvania Department of Military and Veterans Affairs and the Pennsylvania National Guard. The post includes about 18,000 acres of land, with numerous ranges and training areas for the Pennsylvania National Guard and other active-duty and reserve-component military units as well as law-enforcement agencies.
The installation surrounds Memorial Lake State Park and Indiantown Gap National Cemetery. It is served by the Annville, Pennsylvania post office, ZIP Code 17003. As of the 2010 census the population was 143 residents. State House, the official residence of the Lieutenant Governor of Pennsylvania, is located on the grounds.