Is ONE PIECE episode 981 filler?
Canon No, episode 981 of ONE PIECE is canon.
#981
A New Member! 'First Son of the Sea' Jimbei!
新たな仲間! 海侠のジンべエ!
Aired 4 Jul 2021
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.