Fort Allen
Fort Allen may refer to:

Military bases:
 Fort Allen (Carbon County, Pennsylvania), a French and Indian War fort built by Benjamin Franklin in what is now Weissport
 Fort Allen (Westmoreland County, Pennsylvania), an American Revolution-era fort outside of Pittsburgh
 Fort Allen, an American Civil War fort involved in the Battle of New Haven in Nelson County, Kentucky
 Fort Allen (Maine), a former fort in Munjoy Hill, Portland
 Fort Allen (Puerto Rico), an active Puerto Rico National Guard military base

Other uses:
 Fort Allen Park, a public park on the site of the former fort in Portland, Maine
 Fort Allen Elementary School, a primary school in Hempfield Area School District, western Pennsylvania