EDIT, 3 August 2021: HunchBluntley posted this list which should have all games on GOG currently (with the exception of those that are NOT D&D titles but are inspired by it). Make sure to upvote his 24 June 2021 reply!

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Original Post:

Let us make an update of this thread here, as the other one is archived.
https://www.gog.com/forum/general_archive/what_are_all_of_the_dungeons_and_dragons_games_on_gog

Further games that never were on GOG in this thread:
https://www.gog.com/forum/general/what_classic_dd_pc_games_are_we_still_missing_from_gog
Please let me know which titles I missed, so I can add them. For games on GOG or on the GOG wishlist, please add the link. Note that multiple categories (separated with dashes) might belong to the same section (bold). Please check all in an applying section (for example in most browsers with CTRL+F [Windows]).

I add a checkbox next to each game that is or was on GOG, so you can print it out or copy it and check what you have.

Games that are or were on GOG

As of now, all of these games are singleplayer games. Some might be playable in multiplayer, please check the store page. The "Enhanced Edition" games usually are multiplayer compatible.

D&D type RPG wtth party creation:
[ ] Baldur's Gate Enhanced Edition - https://www.gog.com/game/baldurs_gate_enhanced_edition (+4 DLC listed on that page, one of them story DLC: [ ] Siege of Dragonspear)
[ ] Baldur's Gate 2 Enhanded Edition - https://www.gog.com/game/baldurs_gate_2_enhanced_edition
[ ] Baldur's Gate 3 ("coming soon") - https://www.gog.com/game/baldurs_gate_iii
[ ] Icewind Dale Enhanced Edition - https://www.gog.com/game/icewind_dale_enhanced_edition (although not listed on the store page, the expansion "Trials of the Luremaster" which adds some content to "Heart of Winter" is included)
[ ] Icewind Dale 2 Complete - https://www.gog.com/game/icewind_dale_2
[ ] The Temple of Elemental Evil - https://www.gog.com/game/the_temple_of_elemental_evil

D&D type RPG with single character creation:
[ ] Neverwinter Nights Enhanced Edition - https://www.gog.com/game/neverwinter_nights_enhanced_edition_pack or with DLCs https://www.gog.com/game/neverwinter_nights_enhanced_edition_digital_deluxe_edition
[ ] Neverwinter Nights 2 Complete - https://www.gog.com/game/neverwinter_nights_2_complete
[ ] Planescape: Torment Enhanced Edition - https://www.gog.com/game/planescape_torment_enhanced_edition

Currentrly only available as bonus for buying the Enhanced Edition:
[ ] Baldur's Gate: The Original Saga
[ ] Baldur's Gate 2 Complete
[ ] Icewind Dale Complete
[ ] Neverwinter Nights Complete (unsure, content likely identical to Neverwinter Nights Diamond, see below)
[ ] Planescape: Torment

Only available in Digital Deluxe Edition or other DLC:
[ ] Neverwinter Nights Diamond - only available in the Enhanced Edition's Digital Deluxe Edition: https://www.gog.com/game/neverwinter_nights_enhanced_edition_digital_deluxe_edition

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Other RPG (set in the D&D universe but not using D&D rulesets)

Action RPG / Hack'n'Slash
[ ] Forgotten Realms: Demon Stone - https://www.gog.com/game/forgotten_realms_demon_stone

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RTS:
[ ] Dragonshard - https://www.gog.com/game/dungeons_dragons_dragonshard
[ ] Stronghold (Kingdom Simulator, 1992) - https://www.gog.com/game/dd_stronghold_kingdom_simulator

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Collections:

The name of the collection is listed first. The titles within the collection are below without separate checkmarks, as they are not for separate sale. Many of the games are dungeon crawlers, but please check them out yourself for the proper game categorys.

[ [ Forgotten Realms: The Archives Collection One - https://www.gog.com/game/forgotten_realms_the_archives_collection_one
Eye of the Beholder
Eye of the Beholder II
Eye of the Beholder III

[ ] Forgotten Realms: The Archives Collection Two - https://www.gog.com/game/forgotten_realms_the_archives_collection_two
Pool of Radiance (DOS)
Curse of the Azure Bonds
Hillsfar
Secret of the Silver Blades
Pools of Darkness
Gateway to the Savage Frontier
Treasures of the Savage Frontier
Forgotten Realms Unlimited Adventures

[ ] Forgotten Realms: The Archives Collection Three - https://www.gog.com/game/forgotten_realms_the_archives_collection_three
Dungeon Hack
Menzoberranzan

[ ] D&D: Krynn Series - https://www.gog.com/game/dungeons_dragons_krynn_series
Champions of Krynn
Death Knights of Krynn
The Dark Queen of Krynn

[ ] D&D: Ravenloft Series - https://www.gog.com/game/dungeons_dragons_ravenloft_series
Ravenloft: Strahd's Possession
Ravenloft: Stone Prophet

[ ] D&D: Dark Sun Series - https://www.gog.com/game/dungeons_dragons_dark_sun_series
Dark Sun: Shattered Lands
Dark Sun: Wake of the Ravager

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Removed versions of games
Removed due to "Enhanced Edition" being released (the E.E. are still available on GOG and contain all story content of these games, see above):
(please see above, currently those seem to be still available)

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Games that never were on GOG but might still come

Miscellanoeus titles::
Pools of Radiance - Ruins of Myth Drannor - https://www.gog.com/wishlist/games/pool_of_radiance_ruins_of_myth_drannor_1

Birthright: Gorgon's Alliance
D&D: Chronicles of Mystara
D&D: Daggerdale
Descent to Undermountain
Dragon Strike (aka Dragonstrike)
Fantasy Empires

Dragonlance series:
Heroes of the Lance
Shadow Sorcerer
War of the Lance

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Games that never were on GOG and likely won't come

Never on GOG and likely not coming to GOG because DRM is a necessary component of gameplay

Online Account / MMO:
Dungeons And Dragons Online
Neverwinter (MMO 2013)

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Never on GOG and likely never coming to GOG or any other digital store:
Defunct MMOs:
Dark Sun Online: Crimson Sands
Neverwinter Nights (MMO 1992)

Licensing expiration:
Sword Coast Legends

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Not D&D but could be mistaken for it
Turn-based combat RPG
[ ] Torment: Tides of Numenera (multiple editions available) - https://www.gog.com/game/torment_tides_of_numenera or https://www.gog.com/game/torment_tides_of_numenera_legacy_edition or https://www.gog.com/game/torment_tides_of_numenera_immortal_edition

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Uncategorized

Unknown / Further titles (likely might be able to come eventually unless they were MMOs):
Wikipedia - https://en.wikipedia.org/wiki/List_of_Dungeons_%26_Dragons_video_games
Guide by HunchBluntley - https://docs.google.com/document/d/1dG7U3ghjc1-hmh8bcKjOxzvpdQlTPBOzxXkoHhx7yiw/edit?usp=sharing

You missed Neverwinter under not coming here mmo.

Also not in here is Birthright: Gorgon's Alliance

You mean the old 1991 MMO Neverwinter?

No. He's got that one (called Neverwinter Nights). The Warcraft clone Neverwinter ( see https://www.arcgames.com/en/games/neverwinter/ )

Edit:. I had the wrong url

No, that one was listed (Neverwinter Nights). Neverwinter is the 2013 MMO. I added Neverwinter and marked them better to avoid confusion, also with the singleplayer game of the same name.

For easier readability I made section headers bold. Multiple categories with dashes between them might belong to the same section. This should make it easier to find things.

Here's the comprehensive catalogue search listing of all Dungeons & Dragons games sold here (including DLC):
https://www.gog.com/games?sort=bestselling&search=forgotten%20realms%20archives%20%7C%20dark%20sun%20%7C%20ravenloft%20%7C%20krynn%20%7C%20al-qadim%20%7C%20stronghold%3A%20kingdom%20simulator%20%7C%20hasbro%20%7C%20beamdog&page=1 That's being rather generous with the term "RPG" ;) Even though this was a spiritual successor to Planescape: Torment, it's actually using an independent ruleset and setting; it's not a D&D game at all.

EDIT: Also, this... ...is not strictly true -- all these titles were removed from individual sale, but each is still bundled with the respective Enhanced Edition, and will be accessible from one's library (either straight away, or after redeeming a code found in the library) after purchase of the appropriate EE.

Fantasy Empires is another Dungeons and Dragons game not on GOG. Not sure what's the status of that game, but it would be great if we could get it here.

Edit: Great job with the list, by the way! :)

Is it worth mentioning that all of these have the original as free content with the purchase of the Enhanced Edition? With BG1 and 2, you need to redeem a code, but otherwise you're golden.

If anyone cares, I've uploaded the latest version of my (perpetually WIP) guide to D&D titles on GOG to my GDrive.
https://docs.google.com/document/d/1dG7U3ghjc1-hmh8bcKjOxzvpdQlTPBOzxXkoHhx7yiw/edit?usp=sharing

Oh, I did not know. Thank you!

Implemented also info from other posts.

I didn't realize it myself until last month or so. For BG, you click on the game card in your library, then "More" > "Serial Keys" and just copy and paste the redeem code.

I only have the original for NVN, but the enhanced edition does list the original as a bonus on the store page. Same for Planescape and ID... I just don't know how they do it, if it's included in your library automatically (ala Bioshock) or you need to use a code like BG.

For the original BG1, BG2 and Icewind Dale you get a key as you mentioned on the game card in your library. Planescape Torment gets added automatically to your library.

Awesome. Makes things a lot easier.

Why isn't the Interplay's Forgotten Realms RTS title Blood & Magic on here? That was an EXCELLENT D&D licensed game!

I see it's missing one game.

"Games that never were on GOG but might still come"

Spelljammer: the Pirates of Realmspace