Is ONE PIECE episode 465 filler?
Canon No, episode 465 of ONE PIECE is canon.
#465
Justice For the Winners! Sengoku's Strategy in Action!
勝者だけが正義 発動!センゴクの作戦
Aired 5 Sept 2010
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.