- 3 for 1 basis
- A Chronicle of the Flan People
- A Tiefling's Lament
- Aarakocra
- Aasimar
- Aasterinian
- Aballister Bonaduce
- Abbathor
- Abeil
- Abeir-Toril
- Aberration
- Abi-Dalzim's Horrid Wilting
- Ability score
- Abishai
- Abjure
- Able Carter
- Aboleth
- Abomination
- Abrian
- Abrian (druid)
- Absorption
- Abyss
- Accelerate animal growth
- Accelerate lifeline
- Accelerate plant growth
- Acererak
- Achaierai
- Acquisitions Incorporated (sourcebook)
- Adamantine
- Adamantine dragon
- Adamantine golem
- Addazahr
- Aduria
- Advanced Dungeons & Dragons
- Advanced Dungeons & Dragons 1st edition
- Advanced Dungeons & Dragons 2nd edition
- Advantage and disadvantage
- Adventurer
- Adventurer's Vault
- Adventurer's Vault 2
- Adventuring group
- Aegir
- Aegwareth
- Aerdrie Faenya
- Aerdy
- Aerial servant
- Affect normal fires
- Age of Mortals: Dragonlance Campaign Setting Companion
- Ahuizotl
- Air elemental
- Akadi
- Al'Akbar
- Al-Qadim
- Alaghi
- Alamanda
- Alamir's Fundamental Breakdown
- Alberich
- Alchemy jug
- Alderac Entertainment Group
- Aleax
- Alethial
- Alhamazad the Wise
- Alhi
- Alignment
- Alignment (Dungeons & Dragons)
- Alkilith
- Allie Goertz
- Allip
- Allitur
- Alphatia
- Alphatian Empire
- Alustriel's Banner
- Amazon
- Ambar's Palace
- Ambush drake
- Amedio Jungle
- Amn
- Amnizu
- Amphisbaena
- Amulet
- An Adventurer's Guide to Eberron
- Anadar
- Analects of Vondellak
- Anarazel
- Anauroch
- Anauroch: The Empire of Shade
- Angantyr
- Angantyr Arngrimson
- Angantyr Hofundson
- Angel
- Angerroth
- Angrboda
- Animal
- Animal Training
- Animal friendship
- Animal growth
- Animate dead
- Animate objects
- Animus
- Annam
- Annam (Dungeons & Dragons)
- Annis
- Anodius
- Anthraxus
- Anti-creature shell
- Antimagic shell
- Antimatter rifle
- Anuire
- Ao
- Aoa
- Aoskar
- Aperusa
- Apparatus of Kwalish
- Appendix D
- Appendix N
- Appraising
- Aprig
- Arakses Al-Saqar
- Aranea
- Arborea
- Arc of Eternity
- Arcane Order
- Arcane Power
- Arcane trickster
- Arcanist
- Arcanist (Forgotten Realms)
- Arcanopath monk
- Archdevil
- Archlich
- Archomental
- Archon
- Arcolantha
- Ardat
- Aristul
- Arkhan the Cruel
- Arlax Hammermantle
- Armaros
- Armor class
- Armorer
- Arms and Equipment Guide (3e)
- Arnd
- Arngrim
- Artemis Entreri
- Artifact
- Arvandor
- Arvoreen
- Ash zombie
- Ashen husk
- Ask
- Asmodeus
- Asmodeus's Golden Arse
- Asmus Anagoge
- Aspect
- Aspis
- Asrai
- Assassin
- Assassin bug
- Assault on Nightwyrm Fortress
- Astilabor
- Astral dreadnought
- Astral spell
- Astrology
- Athach
- Athar Citadel
- Athas
- Athkatla
- Atonement
- Atroa
- Audhumla
- Audible Glamer
- Audumla
- Augury
- Auppenser
- Aurumvorax
- Avalancher
- Avariel
- Avernus
- Axe of the Dwarvish Lords
- Azalin
- Azalin Rex
- Azbara Jos
- Azor'alq
- Baalzy
- Baba Yaga
- Bael Turath
- Baelnorn
- Baervan Wildwanderer
- Bahamut
- Bahgtru
- Bakemono
- Baklunish
- Baklunish Basin
- Baku
- Balder
- Baldur's Gate: Descent Into Avernus
- Baldur's Gate (city)
- Baleen whale
- Balor
- Banderlog
- Bandit
- Bane (Forgotten Realms)
- Banishment
- Baphomet
- Bar-lgura
- Baravar Cloakshadow
- Barbarian
- Bard
- Barge of Ptah
- Bariaur
- Barkskin
- Barmy Jeffers
- Barrens of Doom and Despair
- Barrier wight
- Barrow of the Forgotten King
- Basilisk
- Basilisk gaze
- Bastion of Broken Souls
- Batley Summerfoot
- Battle of the Cold Vale
- Battlesystem
- Beast
- Bebilith
- Beek Gwenders
- Beguilement
- Beholder
- Bekkah
- Belch Fardown
- Belhifet
- Beltar
- Beory
- Berei
- Bergelmir
- Beringe
- Berna
- Berronar Truesilver
- Berserker
- Bhaergala
- Bheur
- Bigby
- Bill Slavicsek
- Binder
- Birdfolk
- Birthright
- Black Blizzard
- Black Flames
- Black bear
- Black burner
- Black dragon
- Blackmoor
- Blackmoor (Greyhawk)
- Blacksmithing
- Blacksteel
- Blade
- Blade Bravo
- Blade barrier
- Blagothkus
- Blast Spike
- Blasting Pellets
- Bleredd
- Bless
- Blibdoolpoolp
- Blind-Fighting
- Blindness
- Blingdenstone
- Blink
- Blink dog
- Bloatfish
- Blodug-Hofi
- Blood Shallows
- Blood Tor
- Blood War
- Blood hawk
- Bloodhawk
- Bloodsilk spider
- Bloodstone Pass
- Blue Circle Acrobats
- Blue bolt
- Blue dragon
- Blur
- Boalisk
- Boccob
- Bohemian ear-spoon
- Bone rot
- Boneclaw
- Boobrie
- Book of Challenges
- Book of Exalted Deeds
- Book of Marvelous Magic
- Book of Vile Darkness
- Book of Vile Darkness (3e)
- Boots of Elvenkind
- Borchuk
- Bosi
- Bounded accuracy
- Bragi
- Brain in a jar
- Bralm
- Bramble faerie
- Brambleweed
- Brandobaris
- Branta
- Brass dragon
- Brawn Thunderstones
- Breachgnome
- Brechtür
- Breeka
- Brian
- Brian's Island
- Brian Asbury
- Brigand
- Bright Desert
- Brighteye
- Brisingamen
- Brown Mold
- Brown bear
- Browngnaw
- Bruce Cordell
- Bruenor
- Buccaneer
- Buffalo
- Buffoon
- Bulette
- Bulezau
- Buomman
- Burek
- Buri
- BurningMUD
- Burning hands
- Burningwater
- Bussengeist
- Bwimb
- Caarcrinolaas
- Cabal of Thar-Zad
- Cadaver collector
- Caladrius
- Calan
- Calcryx
- Calimshan
- Call lightning
- Call woodland beings
- Callarduran Smoothhands
- Calliope
- Camazotz
- Campaign
- Campaign Guide Reference
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