Sierra On-Line Inc.
- Founded:
- 1979
- Location:
- Fresno, California, U.S.
- Status:
- Acquired
- Website:
- sierra.com (wiki)
- Also known as:
- Sierra Entertainment (from 2002 to present)
Company's most popular games on BestOldGames.net
- After Dark Games (1998) — Publisher
- Caesar 2 (1995) — Publisher
- Simpsons: Hit & Run, The (2003) — Publisher
- 3-D Ultra Lionel TrainTown Deluxe (2000) — Publisher
- Lode Runner: The Legend Returns (1994) — Publisher
- Police Quest: In Pursuit of the Death Angel (1987) — Developer, Publisher
- Jones in the Fast Lane (1991) — Developer, Publisher
- Gabriel Knight: Sins of the Fathers (1993) — Developer, Publisher
- Aces of the Deep (1994) — Publisher
- IndyCar Racing 2 (1996) — Publisher
- The Incredible Machine 2 (1994) — Publisher
- NASCAR Racing 2003 Season (2003) — Publisher
- Aces over Europe (1993) — Publisher
- Birthright: The Gorgon's Alliance (1996) — Publisher
- Quest for Glory 2: Trial by Fire (1990) — Developer, Publisher
- Aliens Versus Predator 2: Gold Edition (2003) — Publisher
- The Incredible Machine (1993) — Publisher
- Aces of the Pacific (1992) — Publisher
- Battle Bugs (1994) — Publisher
- Alien Legacy (1994) — Publisher
- Leisure Suit Larry (1987) — Developer, Publisher
- Gobliins 2: The Prince Buffoon (1992) — Publisher
- Goblins 3 (1993) — Publisher
- Castle of Dr. Brain (1991) — Developer, Publisher
- Zeliard (1990) — Publisher
- Grand Prix Legends (1998) — Publisher
- Viper Racing (1998) — Publisher
- Mixed-Up Mother Goose (1991) — Developer, Publisher
- Black Cauldron, The (1986) — Developer, Publisher
- Ultimate Soccer Manager 2 (1996) — Publisher
- Detroit (1994) — Publisher
- 3-D Ultra Radio Control Racers (1999) — Publisher
- NASCAR Racing 2 (1996) — Publisher
- King's Quest 1: Quest for the Crown (by Roberta Williams) (1990) — Developer, Publisher
- EcoQuest: The Search for Cetus (1991) — Developer, Publisher
- Space Quest: Chapter I - The Sarien Encounter (1986) — Developer, Publisher
- Ecoquest 2 - Lost Secret of the Rainforest (1993) — Developer, Publisher
- Manhunter: New York (1988) — Publisher
- Manhunter 2: San Francisco (1989) — Publisher
- Hoyle: Book of Games - Volume 3 (1991) — Developer, Publisher
- Hoyle: Book of Games - Volume 2: Solitaire (1990) — Developer, Publisher
- Thexder (1987) — Publisher
- Hoyle: Book of Games - Volume 1 (1989) — Developer, Publisher
- Sid & Al's Incredible Toons (1993) — Publisher
- Red Baron (1990) — Publisher
- Half-Life (1998) — Publisher
- Police Quest 2: The Vengeance (1988) — Developer, Publisher
- Leisure Suit Larry 6: Shape Up or Slip Out! (1993) — Developer, Publisher