Here's my list. It's not complete, but it has most of the important characters.
EDIT: I took jcompton's advice and updated my list using Chris Borders's list as a reference. I alphabetized it and made several corrections to the spelling and so forth. (I don't know which characters some of the names on the "definitive list" refer to, so I either left them out or put a question mark next to them. I did manage to figure out that "Kayl at HQ" refers to Sir Ryan Trawl.) I also added the voice actors from Planescape: Torment because I felt like it.
Baldur's Gate:
Dee Bradley Baker - GARRICK, Caldo, Niklos, Taugosz Khosann
Michael Bell - Gatewarden, Nimbul
Jeff Bennett - QUAYLE, XAN, Dream Knight, Drizzt
Greg Berger - Daveorn, Entar Silvershield, Rieltar, Sonner
Earl Boen - MONTARON, Thalantyr
Hamilton Camp - Aldeth Sashenstar, Cadderly, Tethtoril
Jim Cummings - MINSC, Gorion, Mulahey, Tazok
Jennifer Darling - SHAR TEEL
Grey Delisle - SKIE, VICONIA, Brielbara, Nereid
Melissa Disney - IMOEN, Ithmeera
Bill Farmer - YESLICK, Brunos, Irlentree
Brian George - CORAN, Oublek
Ed Gilbert - Ardenor Crush
Michael Gough - Husam, Krestor, Marek
Jennifer Hale - DYNAHEIR, Liia Jannath, Serving Wench
Amber Hood - ALORA, Dryad, Nymph, Tenya
James Horan - Belt
Bert Kramer - Dream Warrior, Seniyad, Taerom Fuiruim
John Mariano - KAGAIN, TIAX, Brage, Slythe, Tuth
Jason Marsden - AJANTIS, Lothander, Tranzig, Varci
Jim Meskimen - EDWIN, KHALID, Jebadoh, Thaldorn
Lani Minella - Townsfolk
Rob Paulsen - KIVAN, Chanter (Candlekeep), Prism, Telman, Volo
Diane Pershing - SAFANA, Centeol, Tamoko
David Prince - Greywolf, Mystery Merchant, Resar
Kevin Michael Richardson - Narrator, Sarevok, Townsfolk
Neil Ross - ELDOTH KRON, Ogrillon, Scar
Hidi Shannon - FALDORN, JAHEIRA, Black Lily, Silke
Jane Signer - Dream Woman, Gellana, Glamarie
Bernadette Sullivan - BRANWEN, Delorna, Dryad
Frank Welker - XZAR, Duke Eltan, Elminster, Korax
Shadows of Amn and Throne of Bhaal (cross-referenced with BG1 and other games):
Charlie Adler: Cowled Wizard, Greed Demon, Kalah, Lynch Mob Noble, Rejiek Hidesman, Rielev, Samuel Thunderburp, Shade Lord, Teos, The Thumb, Uncle Lester, Ignus (PS:T)
Dee Bradley Baker: Dawnbringer Sain, Juriel (Thief Stronghold), Stormherald Nallabir, Garrick (BG1)
Michael Bell: HAER'DALIS, Male Merchant ("You'll find no better prices in Amn..."?), Vittorio the Drunken Lout
Jeff Bennett: Audience Member, Cowled Wizard Superior, Dale the Herder, Drizzt, Pride Demon, Quayle (BG1), Saemon Havarian, Xan (BG1)
Gregg Berger: Isaea Roenal, Oisig Highwatcher, Simyaz
Tony Bumpass: Fhjull (PS:T), Strahan (PS:T)
Dan Castellaneta: Homer Simpson (
The Simpsons), Nordom (PS:T)
Cam Clarke: Aran Linvail, Deril, Shank
Jonathan Cook: Lavok, Sassar, TorGal
Jim Cummings: MINSC, Abazigal (TOB), Enslaved Genie, Gorion, Kahn Xahraa, Lord Jierden, Master Wraith (TOB), Selfish Demon, Saladrex? (TOB), Mulahey (BG1), Tazok (BG1)
Keith David: Vhailor (PS:T)
John De Lancie: Trias (PS:T), Q (
Star Trek: The Next Generation)
Grey Delisle: NALIA, VICONIA, Bubbles, Raelis Shai, Skie (BG1)
Flo Di Re: Ravel (PS:T), Elder of Arroyo (Fallout 2)
Melissa Disney: IMOEN, Surayah El' Farrahd
Michael Dorn: Bhaal (SoA only), Worf (
Star Trek: The Next Generation)
Sheena Easton: Annah (PS:T)
Bill Farmer: Demson, Dermin Courtierdale, Garren Windspear, Yeslick (BG1)
Brian George: Coran (BG1)
Michael Gough: Cowled Wizard, Pirate Lord Desharik, Gaal, Solaufein
Wayne Grace: Announcer, Elhan, Major Domo
Jennifer Hale: MAZZY, Guildmistress Busya, Suna Seni (does not appear), Dynaheir (BG1), Deionarra (PS:T), Fall-from-Grace (PS:T)
Amber Hood: Audience Member, Dili, Lunisia, Alora (BG1), Dryad (BG1), Nymph (BG1)
James Horan: Cowled Wizard, High Merchant Logan Coprith, Sir Ryan Trawl
Roger Jackson: KELDORN, Captive Gladiator, Cowled Wizard, Fanatic, Gaal Heckler
Tony Jay: Kresselack (IWD), Transcendent One (PS:T)
Charity James: Gaal Heckler, Phaere
Nick Jamison: Captain Dennis, Dradeel, Elven Prisoner, Nelleck, Nevin, Ogre Deckhand (Gurgh), Rumar
Maurice LaMarche: YOSHIMO, Amnish Soldier, Avatar of Rillifane, Ceremony Attendee, Chief Inspector Brega, Hendak, Minister Lloyd, Renal Bloodscalp
Tress MacNeille: Edwina, Fear Demon, Female Sailor, Lynch Mob Noble, Priestess of Lolth, Royal High Priestess Senityilli, Tiana
John Mariano: Naljier Skal, Talon Yarryl, Tiax, Kagain (BG1)
Jason Marsden: CERND, Lathan (Thief Stronghold), Ajantis (BG1)
Bill Martin: KORGAN, Ogre Deckhand, Unwilling Gladiator
Jim Meskimen: EDWIN, Fanatic, Male Sailor, Khalid (BG1 & TOB) (also appears in IWD2)
Alan Oppenheimer: Guardian Telwyn, Mornmaster Thaddin Dawnhunter, Sir Sarles
Jeff Osterhage: VALYGAR, Lynch Mob Commoner, Noble At The Fight
Valerie Pappas: Audience Member, Gaal Heckler, Valen
Rob Paulsen: ANOMEN, Biff The Understudy, Drow Male, Elven Soldier, Gaal Supporter, Noble At The Fight, Qadeel (the Deckmaster), Saerk el Farrahd, Shadow Thief, Kivan (BG1), Prism (BG1), Volo (BG1), Morte (PS:T)
Diane Pershing: Adalon, Ceremony Attendee, Female Merchant, Safana (BG1), Centeol (BG1), Tamoko (BG1)
Mitch Pileggi: Dak'kon (PS:T) (
The X Files)
David Prince: Lieutenant Aegisfield, Ribald Barterman
Kevin Michael Richardson: SAREVOK (TOB & BG1), Audience Member, Cohrvale, Corgeig Axehand, Drow Escort, Jailkeep Golem, “You must gather your party before venturing forth”, Bhaal (TOB only), Yaga-Shura (TOB), Narrator (BG1)
Jack Roth: JAN JANSEN, Carbos, Wanev (also appears in IWD2)
Dwight Schultz: Mae’Var, Prince Villynaty, Vithal
Hidi Shannon: JAHEIRA, High Priestess Demin, Drow Female, Melissan (TOB), Black Lily (BG1), Faldorn (BG1 only), Silke (BG1)
Jane Singer: Branwen (BG2 only), Lady Lilith Lurraxol, Matron Mother Ardulace
Kath Soucie: AERIE, Aphril, Ellesime, Gaal Supporter, Priss, Young Sarevok (TOB) (also appears in IWD2)
John Vernon: Baron Ployer, Cowled Wizard, Goldander Blackenrock
B.J. Ward: Audience Member, Bodhi, Faldorn (BG2 only), Lady Delcia, Lady Maria, Lynch Mob Commoner
David Warner: Jon Irenicus
Frank Welker: Avatar of Amaunator, Cor Delryn, Drow Soldier, King Ixilthetocal, Kirinaldo, Philosopher, Rakshasa, Terminsel, Xzar (BG1), Duke Eltan (BG1), Elminster (BG1), Korax (BG1)
Billy West: Drow Slave, Gaelan Bayle, Higgold, Lehtinan, Lord Skarmaen Alibakkar, Prelate Wessalen, Suldanessalar Elven Male
Michael T. Weiss: Nameless One (PS:T)
You'll notice that many of the voice actors portrayed many different characters. For example, the guy who did Gorion's voice also did Minsc's voice, and the gal who did Nalia's voice also did Viconia's voice. (Can you believe it?) Maurice LaMarche also portrayed a variety of characters.
Here are a couple of links that can help you look up voice actors on the internet (just use a search engine to find others):
http://voices.fuzzy.com/default.asp
http://www.voicechasers.org/VideoGames/ ... sgate.html
You can also look at
Forgotten Realms: Baldur's Gate II - Shadows of Amn (2000) (VG) , but as jcompton have pointed out, it contains incorrect data. For example, the cast listing for Throne of Bhaal is a joke.