List of best-selling singles in 1991 (Japan)
# List of best-selling singles in 1991 (Japan)

This is a list of the best-selling singles in 1991 in Japan, as reported by Oricon.

| Ranking | Single | Artist | Release | Sales |
| - | - | - | - | - |
| 1 | "Love Story wa Totsuzen ni" | Kazumasa Oda | February 6, 1991 (1991-02-06) | 2,542,000 |
| 2 | "Say Yes" | Chage and Aska | July 24, 1991 (1991-07-24) | 2,504,000 |
| 3 | "Ai wa Katsu" | Kan | September 1, 1990 (1990-09-01) | 1,863,000 |
| 4 | "Donna Toki mo" | Noriyuki Makihara | June 10, 1991 (1991-06-10) | 1,164,000 |
| 5 | "Hajimari wa Itsumo Ame" | Aska | March 6, 1991 (1991-03-06) | 1,071,000 |
| 6 | "Anata ni Aete Yokatta" | Kyōko Koizumi | May 21, 1991 (1991-05-21) | 1,007,000 |
| 7 | "Lady Navigation" | B'z | March 27, 1991 (1991-03-27) | 1,005,000 |
| 8 | "Shabondama" | Tsuyoshi Nagabuchi | October 25, 1991 (1991-10-25) | 759,000 |
| 9 | "Eyes to Me" | Dreams Come True | April 25, 1991 (1991-04-25) | 686,000 |
| 10 | "Alone" | B'z | October 30, 1991 (1991-10-30) | 686,000 |
