Studio albums

• My Fantasy (1982)
• Utairo no Toki (1982)
• Breezing (1983)
• Whisper (1983)
• Betty (1984)
• Today's Girl (1985)
• Flapper (1985)
• Kyoko no Kiyoku Tanoshiku Utsukushiku (1986)
• Liar (1986)
• Hippies (1987)
• Phantasien (1987)
• Beat Pop (1988)
• Nostalgic Melody (1988)
• Koizumi in the House (1989)
• No. 17 (1990)
• Afropia (1991)
• Travel Rock (1993)
• Otoko no Ko Onna no Ko (1996)
• Kyo (1998)
• Atsugi I.C. (2003)
• Nice Middle (2008)
• Collaborakyon (2011)

Remix albums

• Master Mix Party (1993) as Koizumix Production
• 89–99 Collection: Koizumix Production (1999)

EPs

• Fade Out: Super Remix Tracks (1989)
• Super Remix Tracks II (1990)
• Bambinater (1992) as Koizumix Production
• Inner Beauty (2000)
• Kyō 2 (2001)

Soundtrack albums

• Boku no Onna ni Te wo Dasuna (1987)
• Kaitou Ruby (1988)

Compilations

• Super Best: Thank You Kyoko (1983)
• Celebration (1984)
• Melodies: Kyoko Koizumi Song Book (1985)
• Do You Love Me (1985)
• The Best (1986)
• Ballad Classics (1987)
• CD File vol. 1 (Singles A & B) (1987)
• CD File vol. 2 (Singles A & B) (1987)
• CD File vol. 3 (Singles A & B) (1987)
• Best of Kyong King (1988)
• Ballad Classics II (1989)
• CD File vol. 4 (Singles A & B) (1989)
• K2 Best Seller (1992)
• Anytime (1994)
• Kyon 3, Koizumi the Great 51 (2002)
• K25 Kyoko Koizumi All Time Best (2007)