2chan

2chan may refer to:
 * 2channel (also 2chan, 2ch or 2ch.net), a defunct Japanese textboard founded by Hiroyuki Nishimura
 * 5channel (or 5ch and 5ch.net), its successor owned by American businessman Jim Watkins (also the owner of 8chan)
 * 2ch.sc, a fork of 2channel created and owned by Hiroyuki Nishimura
 * Futaba Channel or 2chan (2chan.net), an unrelated Japanese imageboard, based on 2channel