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
- Caesar II (1995) — Publisher
- After Dark Games (1998) — 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
- IndyCar Racing II (1996) — Publisher
- Gabriel Knight: Sins of the Fathers (1993) — Developer, Publisher
- The Incredible Machine 2 (1994) — Publisher
- Aces of the Deep (1994) — Publisher
- Birthright: The Gorgon's Alliance (1996) — Publisher
- Quest for Glory II: Trial by Fire (1990) — Developer, Publisher
- Aces of the Pacific (1992) — Publisher
- Aces over Europe (1993) — Publisher
- The Incredible Machine (1993) — Publisher
- Leisure Suit Larry (1987) — Developer, Publisher
- Battle Bugs (1994) — Publisher
- Castle of Dr. Brain (1991) — Developer, Publisher
- Alien Legacy (1994) — Publisher
- Gobliins 2: The Prince Buffoon (1992) — Publisher
- Zeliard (1990) — Publisher
- Goblins 3 (1993) — Publisher
- Mixed-Up Mother Goose (1991) — Developer, Publisher
- Red Baron (1990) — Publisher
- Police Quest 2: The Vengeance (1988) — Developer, Publisher
- Leisure Suit Larry 6: Shape Up or Slip Out! (1993) — Developer, Publisher