This is a list of known Pikmin forums. Note that the forums towards the bottom of the list are relatively inactive.
Pikmin Wars: a forum based around a Pikmin text RPG.
[1][2] These are the GameFAQs boards for Pikmin and Pikmin 2.
Pikmin: The Expedition: a site created by Pikmin King 1337, who is the admin. Includes a roleplay section.
[3][4] These are the Neoseeker boards for Pikmin and Pikmin 2.
Pikmin: a site made by a Pikmin fan from NSider after he lost his Pikmin forums.
The forum for this Wiki is at Forum:Index.