Opening theme

OP1: "ウィーアー!" (WE ARE!) (Episodes 1 to 47, 253.5)

Lyrics: Seiko Fujibayashi, Composer: Tanaka Nobuhiro, Arranger: Negishi Takayuki, Song: Kitani Hiroshi

OP2: "Believe" (Episodes 48 to 115)

Lyrics: Taniho Nora, Composer· Arranger: GROOVE SURFERS, Song: Folder5

OP3: "ヒカリへ" (Towards the Sun) (Episodes 116 to 168)

Lyrics and Composers: Tanaka Akihito, Arranger· Song: ザ·ベイビースターズ (The Babystars)

OP4: "BON VOYAGE!" (Bon Voyage!) (Episodes 169 to 206, 253.8)

Lyricist: PANINARO 30 , Composer and Arranger: KOHSUKE OSHIMA, Song: BON-BON BLANCO

OP5: "ココロのちず" (Heart's Navigation Map) (Episodes 207 to 263)

Lyrics : MIZUE, Composer: Kazuki Watanabe, Arranger: Mi Guangliang, Song: BOYSTYLE

OP6: "BRAND NEW WORLD" (Episodes 264 to 278)

Lyrics: Yoshida Yasuhide, Composer: Yoshida Yasuhide; IKUMA, Arranger: IKUMA, Song: D-51

OP7: "ウィーアー!～Seven-person no MaiわらPirates Chapter～" (WE ARE !～The Seven Straw Hat Pirates Chapter～) (Episodes 279 to 283)

Lyrics: Seiko Fujibayashi, Composer: Tanaka Hiroshi, Arranger: Takayuki Negishi, Song: Seven Guys One Piece

OP8: "Crazy Rainbow" (Episode 284~325)

Lyricist: TAKESHI/Kosuke Morimoto Composer: Kosuke Morimoto Arranger: CHOKKAKU, Song : Taki and Tsubasa

OP9: "Jungle P" (Episode 326~372)

Lyricist: 5050, Composer: 5050, Arranger: 5050, Song: 5050

OP10: "ウィーアー!～アニメーショソワソピース 10th Anniversary Ver.～" (WE ARE!～Anime ONE PIECE 10th Anniversary Version～) (Episodes 373 to 394)

Lyricist: Fujibayashi Seiko, Composer: Tanaka Hiroshi, Arranger: AKIRA, Song: TVXQ

OP11: "Share The World"

Lyrics: H.U.B, Composer: Kenichi Maeyamada, Arranger: AKIRA , Song: TVXQ (395~)