List of Oricon number-one albums of 1991
These are the Oricon number one albums of 1991, per the Oricon Weekly Album Charts.[1]
| Issue Date | Album | Artist |
| January 14 | Princess Princess | Princess Princess |
| January 21 | Princess Princess | Princess Princess |
| January 28 | Princess Princess | Princess Princess |
| February 4 | K2C | Kome Kome Club |
| February 11 | K2C | Kome Kome Club |
| February 18 | K2C | Kome Kome Club |
| February 25 | K2C | Kome Kome Club |
| March 4 | Start | Jun Sky Waker(s) |
| March 11 | Green' | Midori Karashima |
| March 18 | Mind Universe | Kudo Shizuka |
| March 25 | Green' | Midori Karashima |
| April 1 | Yamada katsute nai | Yamada katsute nai WINK hoka |
| April 8 | Yamada katsute nai | Yamada katsute nai WINK hoka |
| April 15 | Higher Self | Kyosuke Himuro |
| April 22 | Higher Self | Kyosuke Himuro |
| April 29 | Lindberg IV | Lindberg |
| May 6 | Kome Kome Club | Kome Kome Club |
| May 13 | Kome Kome Club | Kome Kome Club |
| May 20 | Lindberg IV | Lindberg |
| May 27 | Oh! Yeah! | Oda Kazumasa |
| June 3 | Oh! Yeah! | Oda Kazumasa |
| June 10 | Mars | B'z |
| June 17 | Scene II | Aska |
| June 24 | Scene II | Aska |
| July 1 | Artisan | Tatsuro Yamashita |
| July 8 | Washing | Mariko Nagai |
| July 15 | Jealousy | X Japan |
| July 22 | Lucky | Misato Watanabe |
| July 29 | Chou-fleur | Takako Okamura |
| August 5 | Afropia | Kyōko Koizumi |
| August 12 | Afropia | Kyōko Koizumi |
| August 19 | Afropia | Kyōko Koizumi |
| August 26 | Scene II | Aska |
| September 2 | Calendar Girl | Ayumi Nakamura |
| September 9 | Edge of the Knife | Shogo Hamada |
| September 16 | Expo | TMN |
| September 23 | Lluvia | Miki Imai |
| September 30 | Kubojah | Toshinobu Kubota |
| October 7 | Guitarhythm II | Tomoyasu Hotei |
| October 14 | Revolution | Hideaki Tokunaga |
| October 21 | Tree | Chage and Aska |
| October 28 | Tree | Chage and Aska |
| November 4 | Tree | Chage and Aska |
| November 11 | Extra Flight | Lindberg |
| November 18 | Extra Flight | Lindberg |
| November 25 | Million Kisses | Dreams Come True |
| December 2 | Dawn Purple | Yumi Matsutoya |
| December 9 | In the Life | B'z |
| December 16 | Dolls In Action | Princess Princess |
| December 23 | Japan | Tsuyoshi Nagabuchi |
| December 30 | Japan | Tsuyoshi Nagabuchi |
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References