- "Something Has Gone Crack": New Perspectives on J.R.R. Tolkien in the Great War
- "The Sweet and the Bitter": Death and Dying in J. R. R. Tolkien’s The Lord of the Rings
- 1st Century of the First Age
- A Closed Letter to Andrea Charicoryides Surnamed Polygrapheus, Logothete of the Theme of Geodesia in the Empire, Bard of the Court of Camelot, Malleus Malitiarium, Inclinga Sum Sometimes Known as Charles Williams
- A Companion to J.R.R. Tolkien
- A Conspiracy Unmasked
- A Conspiracy Unmasked (The Complete Recordings)
- A Coronal of Silver and Gold
- A Day in the Life of a Hobbit
- A Description of the Island of Númenor
- A Dictionary of Tolkien
- A Elbereth Gilthoniel
- A Far Green Country
- A Fragment of an Epic: Before Jerusalem Richard Makes an End of Speech
- A Gateway to Sindarin
- A Good Omen
- A Hobbit, a Wardrobe, and a Great War: How J.R.R. Tolkien and C.S. Lewis Rediscovered Faith, Friendship, and Heroism in the Cataclysm of 1914-1918
- A Hobbit Journey: Discovering the Enchantment of J.R.R. Tolkien's Middle-earth
- A Journey in the Dark
- A Knife in the Dark
- A Knife in the Dark (soundtrack)
- A Liar and a Thief
- A Long-expected Party (chapter)
- A Magpie's Nest
- A Middle-earth Traveler: Sketches from Bag End to Mordor
- A Night in Rivendell
- A Question of Time: J.R.R. Tolkien's Road to Faërie
- A Secret Vice: Tolkien on Invented Languages
- A Sense of Tales Untold: Exploring the Edges of Tolkien's Literary Canvas
- A Shadow Lies Between Us
- A Shadow of the Past (episode)
- A Short Cut to Mushrooms
- A Short Rest
- A Shortcut to Mushrooms
- A Song of Aryador
- A Spell of Concealment
- A Storm is Coming
- A Thief in the Night
- A Thief in the Night (soundtrack)
- A Thunder Battle
- A Tolkien Bestiary
- A Tolkien Compass: Fascinating Studies and Interpretations of J.R.R. Tolkien's Most Popular Epic Fantasies
- A Troll-Hoard
- A Very Respectable Hobbit
- A Warm Welcome
- A Wilderness of Dragons: Essays in Honor of Verlyn Flieger
- Abaan
- Abigail
- Accursed Years
- Acharn
- Adalbert Bolger
- Adaldrida (Bolger) Brandybuck
- Adalgar Bolger
- Adalgrim Took
- Adam Brown
- Adam Reuel Tolkien
- Adamant
- Adamanta (Chubb) Took
- Adanel
- Adaptations of The Hobbit
- Adaptations of The Lord of the Rings
- Adapting Tolkien
- Adar
- Adar (episode)
- Adelard Took
- Adorn
- Adrahil (disambiguation)
- Adrahil I
- Adrahil II
- Adrian Webster
- Adrift (episode)
- Adso's Camp
- Adurant
- Adûnaic
- Aeglos
- Aeglos (plant)
- Aegnor
- Aelin-uial
- Aerandir
- Aerin
- Afros
- Afterlithe
- Afteryule
- Agaldor
- Agandaûr
- Agar
- Agathor
- Ages of Awakening
- Aghan
- Aglahad
- Aglared
- Aglond
- Aidan Turner
- Ailinel
- Ainairos
- Ainulindalë
- Ainur
- Airefëa
- Aiwenórë
- Akallabêth
- Alalvinórë
- Alan Howard
- Alan Lee
- Alan Menken
- Alastair Duncan
- Alatar
- Albarth
- Albert Dreary
- Alcarin
- Alcarinquë
- Alcarondas
- Aldamir
- Aldarion and Erendis: The Mariner's Wife
- Aldburg
- Aldor
- Aldor (film character)
- Aldudénië
- Alex Funke
- Alex Tarrant
- Alexander Lindsay
- Alexandra Astin
- Alfrida (of the Yale) Bolger
- Algund
- Alinel
- Alison Milbank
- Alistair Browning
- All that Glitters
- All that is gold does not glitter,
- Allan Curless
- Allegiance to Denethor
- Allen & Unwin
- Alley of Roses
- Alloyed (episode)
- Almaren
- Almarian
- Almiel
- Almáriel
- Alphros
- Alqualondë
- Aluin
- Aman
- Amandil
- Amani Johara
- Amaranth Brandybuck
- Amarië
- Amarthiúl
- Amazon Games
- Amazon MGM Studios
- Ambar
- Ambarkanta
- Ambush in Ithilien
- Ambush of Mirkwood
- Ambush of the Rohirrim
- Ambush of the Wargs
- Amdír
- Amelia Kenworthy
- Amelie Child Villiers
- American Tolkien Society
- Amethyst (Hornblower) Bolger
- Amid Weeping There is Joy: Orthodox Perspectives on Tolkien's Fantastic Realm
- Amlach
- Amlaith
- Ammred
- Amnon
- Amon Angren
- Amon Anwar
- Amon Darthir
- Amon Dîn
- Amon Ereb
- Amon Ethir
- Amon Gwared
- Amon Hen
- Amon Lanc
- Amon Lhaw
- Amon Obel
- Amon Rûdh
- Amon Sûl podcast
- Amras
- Amrod
- Amroth
- Amroth's house
- Amrothos
- Amy Amendt-Raduege
- An Ancient Enemy
- An Atlas of Tolkien
- An Awfully Big Adventure: J.R.R. Tolkien
- An Evening in Rivendell
- An Unexpected Cookbook: The Unofficial Book of Hobbit Cookery
- An Unexpected Party
- An Unexpected Party (disambiguation)
- An Unexpected Party (mission)
- An Unexpected Party (soundtrack)
- Anairë
- Anar (Dwarf)
- Anar (War in the North character)
- Anar Kaluva Tielyanna
- Anardil
- Anarríma
- Anborn
- Ancalagon
- Ancient Marsh-dweller
- Andram
- Andrast
- Andrath
- Andreas Bigger
- Andreth
- Andrew Higgins
- Andrew Lesnie
- Andrew McDonald
- Andriel
- Androth
- Andróg
- Anduin
- Andustar
- Andvír
- Andwise Roper
- Andy Gunn
- Andy Serkis
- Andúnië
- Andúril
- Andúril - Flame of the West
- Anessi
- Anfalas
- Angainor
- Angamaitë
- Angband
- Angbor
- Angbor (rock)
- Angelica Baggins
- Angelimir
- Angelo Montanini
- Angerthas
- Angerthas Daeron
- Anglachel
- Angle of Eriador
- Angmar
- Angmar, Malmö Tolkiensällskap
- Angrim
- Angrist
- Angrod
- Anguirel
- Angus Dunn
- Angus McBride
- Anke Eißmann
- Ann-thennath
- Annael
- Annals of Arda
- Annals of Beleriand
- Annals of Valinor
- Anne C. Petty
- Annette Crosbie
- Annie Lennox
- Annon-in-Gelydh
- Annúminas
- Anor-stone
- Anson Roper
- Anthony Boyle
- Anthony Crum
- Anthony Daniels
- Antony Sher
- Anything You Can Imagine
- Anárion
- Aníron
- Anórien
- Aorangi Forest Park
- Appendices
- Appendix A
- Appendix B
- Appendix C
- Appendix D
- Appendix E
- Appendix F
- Appledore
- Approaches to Teaching Tolkien's The Lord of the Rings and Other Works
- April
- April 1
- April 10
- April 11
- April 12
- April 13
- April 14
- April 15
- April 16
- April 17
- April 18
- April 19
- April 2
- April 20
- April 21
- April 22
- April 23
- April 24
- April 25
- April 26
- April 27
- April 28
- April 29
- April 3
- April 30
- April 4
- April 5
- April 6
- April 7
- April 8
- April 9
- Ar-Adûnakhôr
- Ar-Gimilzôr
- Ar-Pharazôn
- Ar-Sakalthôr
- Ar-Zimrathôn
- Arachon
- Arador
- Arador (Gondor)
- Araglas
- Aragorn's Return
- Aragorn's dagger
- Aragorn's standard
- Aragorn (disambiguation)
- Aragorn I
- Aragorn II
- Aragost
- Arahad (disambiguation)
- Arahad I
- Arahad II
- Arahael
- Araman
- Aranarth
- Arandor
- Aranrúth
- Arantar
- Aranuir
- Aranwë
- Araphant
- Araphor
- Arassuil
- Aratan
- Aratar
- Arathorn (disambiguation)
- Arathorn I
- Arathorn II
- Araval
- Aravir
- Aravorn
- Archer
- Archet