Is Bleach episode 275 filler?
Canon No, episode 275 of Bleach is canon.
#275
The Approaching Breath of Death, the King Who Rules Over Death!
迫る死の息吹、死を司る王!
Aired 15 Jun 2010
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.