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