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- January 7: Fujimoto Miki joins Morning Musume
- January 19: Kamei Eri, Michishige Sayumi and Tanaka Reina join Morning Musume as 6th generation members
- March 29:
- April 27: Saito Miuna joins Country Musume
- April 29: Yoshida Marie is born.
- May 7:
- Yasuda Kei graduates from Morning Musume
- Yaguchi Mari becomes sub-leader of Morning Musume
- June 7: Nishida Shiori was born.
- June 18: Hiromoto Ruri was born.
- June 28: Hashimoto Momoko was born.
- August 1: Eguchi Saya was born.
- August 31: Goto Sayaka was born.
- October 21: Oota Haruka was born.
- October 22: Kasahara Momona is born.
- January 29: Akai Freesia - Melon Kinenbi
- February 5: Boogie Train '03 - Fujimoto Miki
- February 19: Morning Musume no Hyokkori Hyoutanjima - Morning Musume
- March 12: Ne~e? - Matsuura Aya
- March 19:
- April 9: Rock 'n' Roll Kenchoushozaichi ~Oboechaina Series~ - Minimoni
- April 23: AS FOR ONE DAY - Morning Musume
- May 1:
- May 8: Chance of LOVE - Melon Kinenbi
- May 14: Minimoni Kazoe Uta ~Ofuro Version~ / Minimoni Kazoe Uta ~Date Version~ - Minimoni
- May 21: GET ALONG WITH YOU - Nakazawa Yuko
- June 4: GOOD BYE Natsuo - Matsuura Aya
- June 18: Scramble - Goto Maki
- July 9: Kowarenai Ai ga Hoshii no / GET UP! Rapper / BE ALL RIGHT! - SALT5, 7AIR, 11WATER
- July 16: Tokyo Kirigirisu - Maeda Yuki
- July 24: Uwaki na Honey Pie - Country Musume ni Konno to Fujimoto
- July 30: Shabondama - Morning Musume
- August 6: Iku ZYX! FLY HIGH - ZYX (debut)
- August 13: 22sai no Watashi - Abe Natsumi
- August 20: SEXY NIGHT ~Wasurerarenai Kare~ - ROMANS
- August 27: Daite yo! PLEASE GO ON - Goto Maki
- September 3: 4U ~Hitasura~ - Ichii Sayaka
- September 10: MI DA RA Matenrou - Melon Kinenbi
- September 18:
- September 26: THE LAST NIGHT - Matsuura Aya
- October 16: CRAZY ABOUT YOU - Minimoni
- October 29: FIRST KISS - Aa!
- November 6: Go Girl ~Koi no Victory~ - Morning Musume
- November 12: Senpai ~LOVE AGAIN~ - Country Musume ni Konno to Fujimoto
- November 19: Mirakururun Grand Purin! / Pi~hyara Kouta - Abe Natsumi and Minimoni
- November 27: Genshoku GAL Hade ni Yukube! - Goto Maki
- December 3: Kawaii Kare - Melon Kinenbi
- December 10: Shiroi TOKYO - ZYX
- January 29: T・W・O - Matsuura Aya
- February 5: Makking GOLD 1 - Goto Maki
- February 14: Koinu Dan no Monogatari Original Soundtrack - V.A.
- February 26: MIKI ① - Fujimoto Miki (debut)
- March 12: 1st Anniversary - Melon Kinenbi (debut)
- March 26: No.5 - Morning Musume
- April 23: Os Avrio ~Ai wa Matte Kurenai~ - Iida Kaori (debut)
- October 22: Paradinome ~Koi ni Mi wo Yudanete~ - Iida Kaori
- November 21: Sweet talk Gēn wǒ Shuō - Ruru
- December 17: Petit Best 4 - Hello! Project
- January 28: Morning Musume's Major Debut 5th anniversary
- September 14: Morning Musume's Formation 6th anniversary
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