| Fort Anderson | Fort Anderson (California) | Fort Anderson (disambiguation) |
| Fort Anderson (Kentucky) | Fort Anderson (North Carolina) | Fort Andres Bonifacio |
| Fort Andrew | Fort Andrews | Fort Andross |
| Fort Anjediva | Fort Anké | Fort Anke |
| Fort Ann | Fort Ann (disambiguation) | Fort Ann (town), New York |
| Fort Ann (town), WA County, New York | Fort Ann (town), Washington County, New York | Fort Ann (village), New York |
| Fort Ann (village), WA County, New York | Fort Ann (village), Washington County, New York | Fort Ann Formation |
| Fort Ann, California | Fort Ann, New York | Fort Ann, NY |
| Fort Anne | Fort Anne (Gloucester, Massachusetts) | Fort Anne (Salem, Massachusetts) |
| Fort Anne National Historic Park | Fort Anne National Historic Site of Canada | Fort Antes |
| Fort Anthonio | Fort Antoine Theatre | Fort Antonia |
| Fort Antonio | Fort AP Hill | Fort Apache |
| Fort Apache (disambiguation) | Fort Apache (film) | Fort Apache (Fort) |
| Fort Apache (hostile place) | Fort Apache (military post) | Fort Apache (recording studio) |
| Fort Apache and Theodore Roosevelt School | Fort Apache Formation | Fort Apache Historic District |
| Fort Apache Historic Park | Fort Apache Indian Reservation | Fort Apache Indian Reservation, Arizona |
| Fort Apache Napoli | Fort Apache Reservation | Fort Apache Resvn |
| Fort Apache Studio | Fort Apache Studios | Fort Apache the Bronx |
| Fort Apache, Arizona | Fort Apache, The Bronx | Fort Apache, the Bronx |
| Fort Apalachicola | Fort Apocalypse | Fort Apollonia |
| Fort Apple River | Fort Arbuckle | Fort Arbuckle (disambiguation) |
| Fort Arbuckle (Florida) | Fort Arbuckle (Oklahoma) | Fort Arbuckle Site |
| Fort Arbuckle Site (disambiguation) | Fort Arbuckle Site (Hoover, Oklahoma) | Fort Archambault |
| Fort area | Fort Argyle | Fort Armistead |
| Fort Armistead (Tennessee) | Fort Armsrong, Eastern Cape | Fort Armstrong |
| Fort Armstrong (Alabama) | Fort Armstrong (disambiguation) | Fort Armstrong (Hawaii) |
| Fort Armstrong (Illinois) | Fort Armstrong Hotel | Fort Armstrong Theatre |
| Fort Armstrong, (Hawaii) | Fort Armstrong, Eastern Cape | Fort Armstrong, Hawaii |
| Fort Armstrong, Illinois | Fort Arnala | Fort Arnold |
| Fort Ashby | Fort Ashby High School | Fort Ashby, Virginia |
| Fort Ashby, West Virginia | Fort Ashby, WV | Fort Asiniboine |
| Fort Asinniboine | Fort Assembly constituency | Fort Assinaboine |
| Fort Assinboine | Fort Assiniboine | Fort Assiniboine (Alberta) |
| Fort Assiniboine Sandhills Wildland Provincial Park | Fort Assiniboine, AB | Fort Assiniboine, Alberta |
| Fort Assinniboine | Fort Assumption | Fort Assumption (Tennessee) |
| Fort Astor | Fort Astoria | Fort at Bathinda |
| Fort at bathinda | Fort at Buciumi | Fort at Clark's Point |
| Fort at Lahaina | Fort at Number 4 | Fort at River's Bend |
| Fort at Salisbury Beach | Fort at Salisbury Point | Fort at Sandy Hook |
| Fort at Willets Point | Fort Atkinson | Fort Atkinson (disambiguation) |
| Fort Atkinson (Kansas) | Fort Atkinson (Nebraska) | Fort Atkinson (WI) |
| Fort Atkinson Bridge | Fort Atkinson Formation | Fort Atkinson High School |
| Fort Atkinson Limestone | Fort Atkinson Municipal Airport | Fort Atkinson State Park |
| Fort Atkinson State Preserve | Fort Atkinson Water Tower | Fort Atkinson, IA |
| Fort Atkinson, Iowa | Fort Atkinson, Kansas | Fort Atkinson, WI |
| Fort Atkinson, Wi | Fort Atkinson, Wisconsin | Fort Atlantic |
| Fort au Fer (New York) | Fort Au Glaize | Fort Aubervilliers |
| Fort Aubin | Fort Aubin-Neufchâteau | Fort Aubrey |
| Fort Augusta | Fort Augusta Adult Correctional Centre | Fort Augusta Prison |
| Fort Augustaborg | Fort Augustus | Fort Augustus Abbey |
| Fort Augustus Abbey School | Fort Augustus Pier railway station | Fort Augustus railway station |
| Fort Augustus, Alberta | Fort Aurangabad | Fort Austin |
| Fort Avenue | Fort Avenue (disambiguation) | Fort Avenue Line |
| Fort Ében-Émael | Fort Énet | Fort Île-aux-Noix |
| Fort à la Corne | Fort à la Corne kimberlite field | Fort à la Corne Provincial Forest |
| Fort à la Corne Trail | Fort Babine | Fort Babine, British Columbia |
| Fort Babylon | Fort Bain | Fort Bainbridge |
| Fort Baker | Fort baker | Fort Baker (Humboldt County) |
| Fort Baldwin | Fort Baldwin Historic Site | Fort Ball |
| Fort Ballance | Fort Ballance (including associated positions at Fort Gordon) | Fort Banks |
| Fort Banks (Australia) | Fort Banks (disambiguation) | Fort Banks (Massachusetts) |
| Fort Banks Mortar Battery | Fort Barbee Hotel | Fort Barbonnet |
| Fort Bard | Fort Barfoot | Fort Barfoot, Virginia |
| Fort Barnwell, North Carolina | Fort Barrancas | Fort Barrancas Historical District |
| Fort Barrancas, FL | Fort Barrancas, Florida | Fort Barrett |
| Fort Barrette Road | Fort Barrington | Fort Barrington, Antigua and Barbuda |
| Fort Barry | Fort barton | Fort Barton |
| Fort Barton Site | Fort Bas de la Rivière | Fort Bascom |
| Fort Basinger (Seminole War Fort) | Fort Basinger, FL | Fort Basinger, Florida |
| Fort Bassein | Fort Batenstein | Fort Bath |
| Fort Bath en Bath | Fort Batticaloa | Fort Battleford |
| Fort Battleford National Historic Site | Fort Battleford, Saskatchewan | Fort Baxter |
| Fort Baxter (disambiguation) | Fort Baxter (Kansas) | Fort Bay |
| Fort Bayard | Fort Bayard (disambiguation) | Fort Bayard (Washington, D.C.) |
| Fort Bayard Historic District | Fort Bayard Medical Center | Fort Bayard National Cemetery |
| Fort Bayard Park | Fort Bayard Site | Fort Bayard, New Mexico |
| Fort Beaséjour | Fort Beasejour | Fort Beaufort |
| Fort Beaufort Hospital | Fort Beaufort Mental Hospital | Fort Beaufort UFO incident |
| Fort Beaufort, Eastern Cape | Fort Beauharnois | Fort Beauregard |
| Fort Beauregard (disambiguation) | Fort Beauregard (South Carolina) | Fort Beauregard (Virginia) |
| Fort Beauséjour | Fort Beauséjour (New Brunswick) | Fort Beauséjour, New Brunswick |
| Fort Beausejour | Fort Beausejour (New Brunswick) | Fort Beausejour, New Brunswick |
| Fort Bedford | Fort Beekenburg | Fort Beggs |
| Fort Belan | Fort Belgica | Fort Belin |
| Fort Belknap | Fort Belknap (disambiguation) | Fort Belknap (Newcastle, Texas) |
| Fort Belknap (Texas) | Fort Belknap Agency | Fort Belknap Agency, Montana |
| Fort Belknap Agency, MT | Fort Belknap College | Fort Belknap Electric Cooperative |
| Fort Belknap Indian Community | Fort Belknap Indian Community of the Fort Belknap Reservation of Montana | Fort Belknap Indian Reservation |
| Fort Belknap Reservation | Fort Belknap, Montana | Fort Belknap, Texas |
| Fort Bell | Fort Bell Army Airfield | Fort Belle Fontaine |
| Fort Belle Fontaine County Park | Fort Bellefontaine | Fort Bellegarde |
| Fort Bellingham | Fort Belmont | Fort Belvedere |
| Fort Belvedere (disambiguation) | Fort Belvedere, Berkshire | Fort Belvedere, Surrey |
| Fort Belvoir | Fort Belvoir (VA) | Fort Belvoir Community Hospital |
| Fort Belvoir North Area | Fort Belvoir, VA | Fort Belvoir, Virginia |
| Fort Belvoir, Virginia (CDP) | Fort Bend | Fort Bend Austin High School |
| Fort Bend Baptist Academy | Fort Bend Bush High School | Fort Bend Christian Academy |
| Fort Bend Clements High School | Fort Bend County | Fort Bend County Courthouse |
| Fort Bend County Libraries | Fort Bend County Library | Fort Bend County Public Library |
| Fort Bend County Real Estate | Fort Bend County Toll Road Authority | Fort Bend County, Texas |
