| Fort Adams | Fort Adams (Ohio) | Fort Adams State Beach |
| Fort Adams State Park | Fort Adams, Mississippi | Fort Adams, MS |
| Fort Adobe | Fort Agoda | Fort Agra |
| Fort Aguada | Fort Aguada (Bombay) | Fort Aguada (Goa) |
| Fort Aguada Beach Resort | Fort Ahilya | Fort Ahmadabad |
| Fort Ahmedabad | Fort Al Jalali | Fort Al Mirani |
| Fort Al-Ghwayzi | Fort Al-Mirani | Fort Alabama |
| Fort Albany | Fort Albany (Arlington, Virginia) | Fort Albany (disambiguation) |
| Fort Albany (Ontario) | Fort Albany 67 | Fort Albany 67, Ontario |
| Fort Albany Airport | Fort Albany First Nation | Fort Albany, Ontario |
| Fort Albert | Fort Alcatraz | Fort Alexander |
| Fort Alexander (disambiguation) | Fort Alexander (Hawaii) | Fort Alexander (Saint Petersburg) |
| Fort Alexander (St. Petersburg) | Fort Alexander First Nation | Fort Alexander, Manitoba |
| Fort Alexander, Manitoba, Canada | Fort Alexandria | Fort Alexandria, British Columbia |
| Fort Alexandrovsk | Fort Alexandrovsky | Fort Algernon |
| Fort Algiers | Fort Alice | Fort Allen |
| Fort Allen (Carbon County, Pennsylvania) | Fort Allen (disambiguation) | Fort Allen (Maine) |
| Fort Allen (Pennsylvania) | Fort Allen (Puerto Rico) | Fort Allen (Westmoreland County, Pennsylvania) |
| Fort Allen Elementary School | Fort Allen Park | Fort Allen, Puerto Rico |
| Fort along Den Ham | Fort Altena | Fort Amador |
| Fort Amezquita | Fort Amherst | Fort Amherst (disambiguation) |
| Fort Amherst (Newfoundland and Labrador) | Fort Amherst (Prince Edward Island) | Fort Amherst Lighthouse |
| Fort Amherst lighthouse | Fort Amherst, St. John's | Fort Amherstburg |
| Fort Amiel Museum | Fort Amsterdam | Fort Amsterdam (Curaçao) |
| Fort Amsterdam (Curacao) | Fort Amsterdam (disambiguation) | Fort Amsterdam (fort) |
| Fort Amsterdam (Ghana) | Fort Amsterdam (New Amsterdam) | Fort Amsterdam (Sint Maarten) |
| Fort Amsterdam, Ambon | Fort Amsterdam, Ghana | Fort Ancient |
| Fort Ancient (Lebanon, Ohio) | Fort Ancient culture | Fort Ancient Culture |
| Fort Ancient culture pottery | Fort Ancient Indians | Fort Ancient State Memorial |
| Fort Ancient Valley Conference | Fort Ancient, OH | Fort Ancient, Ohio |
| Fort and Gates of Ahmedabad | Fort and Shalamar Gardens in Lahore | 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 |
