RYTHEM (リズム, Rizumu) is a Japanese band consisting of two female members:

- Yui Nītsu (ゆいにいつ) on piano
Real name: Nitsu Yui (新津 由衣), a.k.a "Yui"
Birthday: 17/8/1985

- Yukari Katō (ゆかりかとう) on guitar
Real name: Katō Yukari (加藤 有加利), a.k.a "Yuka"
Birthday: 3/4/1985)

Notable songs:
- Harmonia (ハルモニア), 2nd ending theme song for Naruto (episodes 26-51)
- Hōkigumo (ホウキ雲), 1st opening theme song (episodes 1-29) and 7th ending theme song for Yakitate!! Japan (episode 69)
- Kokoro Biidama (ココロビーダマ), 6th ending theme song for Yakitate!! Japan (episodes 63-68)
- Sakura Uta (桜唄), 1st ending theme song for Deltora Quest.

Discography:
- Albums -
1) Utatane (ウタタネ) (June 23, 2004)
2) Mugen Factory (夢現ファクトリー) (May 24, 2006)

- Singles -
1) Harmonia (ハルモニア) (May 21, 2003)
2) Tenkyu (てんきゅっ) (August 6, 2003)
3) Blue Sky Blue (ブルースカイ・ブルー) (November 19, 2003)
4) Hitoritabi Shararuran (一人旅シャラルラン) (April 21, 2004)
5) Mangekyō Kirakira (万華鏡キラキラ) (May 26, 2004)
6) Hōki Gumo (ホウキ雲) (January 26, 2005)
7) Mikazuki Rhapsody (三日月ラプソディー) (August 24, 2005)
8) 20 Tsubu no Kokoro (20粒のココロ) (January 1, 2006)
9) Kokoro Bīdama (ココロビーダマ) (March 1, 2006)
10) Negai (願い) (April 26, 2006)
11) Sakura Uta (桜唄) (February 28, 2007)