Battlestar Wiki:Canon

Canon describes those people and events that are an official part of a fictional universe.

The term is used to distinguish those "facts" about and within a fictional universe that are accepted against those that are hypothesised by fans and/or the result of novels and other spin-offs that may not be recognised by the original creators. For example, there have been a great many novels written about Star Trek portraying various adventures of the characters. These novels are non-canonical, and their events did not "actually occur" within the Star Trek universe.

What's Canonical in Battlestar Galactica?

The Battlestar Wiki:Citation Jihad project article details sources that are considered official information for the Original and Re-imagined Series. Visit that article for preferred official resources. Generally, content from any aired episodes (including the re-imagined Battlestar Galactica Mini-Series) from the Original Series and Re-imagined Series, interviews and podcasts from cast and crew, and publicity information from the Sci-Fi Channel website can be considered canonical unless otherwise retconned or retracted by the official sources.