Pretty much every voice actor in Star Wars: The Old Republic is really great

All of the actors for Command & Conquer: Red Alert 2 were fantastic, but certain things stick with you forever.

I played The Last Campfire recently. It's a small puzzle game and the only voice is the narrator, Rachel August. Maybe it's just her accent but I think her voice has a haunting otherworldly beauty that just makes the game.

David Lodge as Grigori in dragon's dogma.

I don't even usually care about voice actors, but he did such a good job that I looked for him specifically in the credits and remember him to this day.

Kreia from KOTOR 2 really gave an astonishingly good performance, as did Bao-dur in the game game.

Disco Elysium has the best voice acting that's ever enhanced my experience. Others might be objectively better but never have I been so immersed in a story

I can't think of any game at the moment that was particularly notable across the board, but I can think of a few specific performances.

Kazuhiro Nakaya as Nishiki and later Ichiban in the Yakuza/Like a dragon series. He is fantastic at getting the character's personality across just in general scenes, and the emotional moments genuinely stick with me.

Rene Zagger as Emet Selch in FFXIV. That game has some fantastic performances but Emet Selch's is honestly one of my favorites. Every one of his lines is delivered perfectly. The arrogance theatrics that later tive way to genuine anger and sadness at what he's gone through. Along with more specifics I won't get into. 100%, A+ Performance.

Though, actually... Now that I think about it... The Persona 3 Reload dub is probably one of the best English dubs for a Japanese game in a looooong time. And generally they're pretty good these days. But that one nails it.

Vampire the Masquerade: Bloodlines

Every Character in it has stellar voice over, I can't think of anyone who's just average.

Star Wars: The Old Republic

Has a great cast too. The voice behind Bastilar is also female Shepard. Her name is Jennifer Hale.

Every actor in 'Still Wakes the Deep'. I don't usually like that type of game - you don't really have a great deal of agency, you can't fight only run, there are sudden deaths in some sections - but the overall atmosphere, the design, and that perfect voice casting drew me in. I think it's still on Game Pass if you want to see and hear it for yourselves.

A bit part, perhaps, but George Ledoux as DUNCAN FISHER MechWarrior 4 Mercenaries!

I have to plug in my favorite vg voice actor: Kellen Goff! A recurrent cast for the Five Nights at Freddy's franchise, and one of the best performances in League of legends! His range and vocal control is crazy, plus he looks like a really fun guy based on his multiple interviews.

Notable roles:
Fiddlesticks (League of Legends)
Arnold (Five Nights at Freddy's: Secret Of The Mimic)
Funtime Freddy (Five Nights at Freddy's: Sister Location)

And a really fun watch of him explaining how to do the Fiddelsticks voice: https://www.youtube.com/watch?v=czsRZd2-6Ac

Karen Dunbar - also a legendary Scottish comedian.

I mean, the new Indiana jones is pretty incredible.

I really love the Voice Acting in Telltale's The Walking Dead series. Just superb story and the actor's really sell a superb script. One of the better stories I've seen in Video Games.

Path of Exile has some good ones, but the emperor that narrates the labyrinth and the captain of the ship that rescues you are my favorites.

Death from Darksiders. But that's cheating.

https://www.youtube.com/watch?v=OYQDnV092hI

The voice acting in Tangle Tower (a point and click murder mystery game) is 10/10