UnderGround Online
- Review by Jonah Falcon, A-. "There are some conceptual kinks in the armor, but nothing that a good patch and future expansion couldn't fix."
- http://www.ugo.com/channels/games/features/moo3/review.asp

GameSpy.com
- Review by William Abner, 76%. "There are things to like about this new version, especially as a multiplayer game, but in the end there are too many issues, big and small, for it to reach the nearly unreachable standard set by its predecessors."
- http://archive.gamespy.com/reviews/february03/moo3pc/

GameSpot
- Reviewed by Sam Parker [6.7/10]. Features screen shots, gameplay movies, secrets, FAQs, and downloadable trial version and patches.
- http://www.gamespot.com/pc/strategy/masteroforion3/

DreamStation.cc
- Reviewed by CPaladino, [5/10]. "The sound effects are blah, and the graphics are blah, and the game wasn't fun."
- http://www.dreamstation.cc/reviews/computer/master_of_orion_3/

Stratos Group
- Review by VGer, 4.3/5. "Whatever flaws MoO3 has, it is, without doubt, the best game ever in its genre."
- http://www.stratosgroup.com/reviews/games.php?selected=0303moo3

Quarter to Three
- Review by Tom. "Complexity itself isn't a bad thing, but poorly organized complexity can be the kiss of death."
- http://www.quartertothree.com/reviews/moo3/moo3-1.shtml