Is Bleach episode 345 filler?
Canon No, episode 345 of Bleach is canon.
#345
Uryu is Attacked, A Threat Draws Near the Friends!
襲われた雨竜、仲間達に迫る脅威！
Aired 31 Oct 2011
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.