Number One, Number 1, No. 1, or #1 could be a reference to:
- Number 1, BIGBANG's first Japanese album, or its title track, "Number 1".
- NO. 1, BoA's second Korean album.
- #1, Jaurim's first Japanese studio album.
- "No. 1", a song recorded by F.Cuz, track #5 on their third Korean mini-album, For Century Ultimate Zest.
- "#1", Ling toshite sigure's first demo.
- "No.1", a song recorded by 7HOUSE, track #7 on their second album, 2 ~February~.
- "NO. 1", a song recorded by BoA, track #1 of her Korean album of the same name and its Japanese version, the second A-side of her eighth Japanese single, "Kiseki / NO. 1".
- "#1", a song recorded by Kuroki Meisa, track #4 of her first mini-album, ATTITUDE.
- "NO. 1 (Album Version)", a song recorded by Matsuda Seiko, track #8 of her 15th album, Citron.
- "No. 1", a song recorded by Secret, B-side on their first single, "Shy Boy".
- "No.1", a song recorded by ↑THE HIGH-LOWS↓, track #2 on their fifth album Relaxin' WITH THE HIGH-LOWS.
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