What is your favorite game OST ?

Far Cry 3 Blood Dragon
Mass Effect 2
The Elder Scrolls III: Morrowind

If I can be mentally brought back to (a) part(s) of the game just by hearing the related track(s), that OST is good enough to be a "favorite" in my book, I suppose.

Some OSTs I go back to every once in a while would be:
Catherine OST
Dreaming Mary OST
Vampire: The Masquerade - Bloodlines OST

• The Persona games

• The Final Fantasy games (especially everything from 7 and all of the vocal themes from 8-10)

• The World Ends With You

• Ocarina of Time has great songs, but they're all really short :(

• Currently playing Bravely Default, and the best thing about it is its music--which is not a complaint (I didn't want to move on from Florem because I fell in love with that song, lol)

When you've played as many games as I have, the "favorite OST" is not a thing anymore. There are just so many good tracks from so many different games.

The Elder Scrolls games certainly come to mind. Jeremy Soule did amazing work on those.
Divinity: Original Sin 2 had an exceptional orchestral OST.
Mass Effect trilogy OST is just fantastic and emotional through and through.
Last two Deus Ex games... Michael McCann absolutely nailed it!
The Witcher trilogy OST just takes me places...
Bastion is praised for it's jammy OST.
Mirror's Edge and ME: Catalyst were frequent on my playlist as well. They were composed by and very much in recognizable style of Solar Fields.
DOOM... Don't even get me started on DOOM :D
...

No doubt I've left out some fantastic OST's but, as I've mentioned before, there are just too many to list them all here.

Deus Ex - The Synapse/Hong Kong Streets
Darkest Dungeon - The Final Combat

The Witcher 1, Life is Strange, Final Fantasy 6+7, Mass Effect series, Skyrim, Hollow Knight, the list goes on

I can think of many, but the Commandos 2 and 3 soundtracks by Mateo Pascual stand out for me. https://open.spotify.com/album/7IcA4JATWLHXTbqCvftl6y?si=TKM2SV_jTCu3dlB_nGpDbQ https://open.spotify.com/album/2nWEpek6ES3TiqYXgBacss?si=w1UUeXXGTqmjOFmFIxFJHQ

Settlers IV

Arcanum: Of Steamworks and Magick Obscura
https://youtu.be/5LHLAcd14b4

In no particular order:

Outcast
Freelancer
Baldur's Gate 2
Neverwinter Nights 1
Grim Fandango
Hitman Codename 47
Hitman 2 (the actual second game in the series)
Star Trek Bridge Commander
Mass Effect
Morrowind
Commandos 2
Every Monkey Island game

Ori and the Blind Forest

Shovel Knight OST
The Messenger OST Disc 1 (The Past) & Disc 2 (The Future)

I find many very pleasant to listen to even outside of games, but the ones that really stuck with me:
Morrowind's and Oblivion's menu theme
Basically anything from Child of Light.
I do remember Ori and the Blind Forest had great music that was pleasant to listen to, but can't recall it :D

Machinarium. No contest.

https://youtu.be/ZRtCOJ6yrXw?t=16

Spotify

Hollow Knight
Transistor
STRAFE
PAYDAY 2
Far Cry 3 Blood Dragon
DUSK
Deus Ex
Deus Ex: Human Revolution
Deus Ex: Mankind Divided

Va-11 Hall-a or anything from Super Giant Games

• Diablo 1
• Killer Instinct Killer Kuts
• Killer Instinct Gold
• The Legend of Zelda - Ocarina of Time
• Vampire the Masquerade: Bloodlines
• Doom 3 (especially the Main Theme... hell yeah! 🤘)

red dead redemption 1 and 2 <3

Got three that are tied for absolute first place the best.

Analogue: A Hate Story

Bastion

I Shall Remain

Nier Automata,
The Witcher 3 as a close second.

A few of my favorite OST is:
The 13th Anthology: https://www.youtube.com/watch?v=jS-aYV_mIQA
and
Fate of the unknown: https://www.youtube.com/watch?v=SrNU8GmfSxU

Both are from the Kingdom Hearts series.

https://www.youtube.com/watch?v=AB6sOhQan9Y <3

FFXIV
Fable
Loz - Ocarina of time
Loz - Majora's Mask
JSR/F

Some of my all time favorites:
1) Legacy of Kain: Soul Reaver
2) Deus Ex Human Revolution: Barret Boss Fight
3) Deus Ex Human Revolution: Icarus
4) Chrono Trigger: To Far Away Times
5) Mirror's Edge: Lisa Miskovsky - Still Alive Radio Edit
6) Unreal: Depths Of Rajiga
7) Shadowman - Main soundtrack
8) Jazz Jackrabbit: Tubelectric
9) Need For Speed HP2: Hot Action Cop - Going Down On It and the Instrumental
10) Need For Speed HP 2012: 30 Seconds to Mars - Edge of the Earth
11) FIFA 2012: Glasvegas - The World Is Yours
12) Duke Nukem: Megadeth Theme