Is ONE PIECE episode 697 filler?
Canon No, episode 697 of ONE PIECE is canon.
#697
One Shot One Kill! The Man Who Will Save Dressrosa!
一撃必殺 ドレスローザを救う男
Aired 14 Jun 2015
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.