Is ONE PIECE episode 83 filler?
Canon No, episode 83 of ONE PIECE is canon.
#83
The Island Where Snow Lives! Climb the Drum Rockies!
雪の住む島！ドラムロッキーを登れ！
Aired 7 Oct 2001
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.