ISN News: Forums
Multiple message boards focusing on Babylon 5 and Crusade.

Yahoo! Groups: B5freshers
Discussion of episodes as they are broadcast, intended as a spoiler-free zone for new fans. [Yahoo! registration required.]

Jeff's Babylon 5 Message Center
Public bulletin board.

Babylon 5 Message Board
Discussion about B5 and Crusade.

rec.arts.sf.tv.babylon5.moderated Newsgroup Information Page
Information about what makes for acceptable or unacceptable posts to the newsgroup.

Allscifi: Babylon 5
Message board for pressing issues: Was Dr. Franklin a robot, from where did Londo get his liver spots, and what was Delenn's finest moment?

Yahoo! Groups: Groucho's Babylon 5 Calvacade
A home for a merry band of longtime B5 fans and other strange folks. Includes message board and chat. [Yahoo! registration required.]

Chicago Babylon 5 Discussion List
A mailing list for residents of the Chicago region to discuss the show and related projects.

The Zocalo
All the issues of the discontinued online newsletter.

The Babylon 5 League
A B5 message board.

The UK Babylon5 FAQ and InfoBase
Frequently asked questions and information for the uk.media.tv.sf.babylon5 Usenet newsgroup.

Code Sigma 957
Babylon 5 message boards with discussion areas for each of the major races and other popular science fiction shows.

Booji's Communication Center
A cozy discussion forum inhabited by friendly fans of Babylon 5 and Booji.

Scifi.com: Babylon 5
Message board provided by the Sci-Fi Channel.

NW-B5 - The Pacific North-West Babylon 5 Mailing List
Provides information on events in the British Columbia Lower Mainland, Vancouver Island, and upper Washington state community.