This is a list of the best-selling singles in 1991 in Japan, as reported by Oricon.[1]
| Ranking | Single | Artist | Release | Sales | |
|---|---|---|---|---|---|
| 1 | "Love Story wa Totsuzen ni" | Kazumasa Oda | 2,542,000 | ||
| 2 | "Say Yes" | Chage and Aska | 2,504,000 | ||
| 3 | "Ai wa Katsu" | Kan | 1,863,000 | ||
| 4 | "Donna Toki mo" | Noriyuki Makihara | 1,164,000 | ||
| 5 | "Hajimari wa Itsumo Ame" | Aska | 1,071,000 | ||
| 6 | "Anata ni Aete Yokatta" | Kyōko Koizumi | 1,007,000 | ||
| 7 | "Lady Navigation" | B'z | 1,005,000 | ||
| 8 | "Shabondama" | Tsuyoshi Nagabuchi | 759,000 | ||
| 9 | "Eyes to Me" | Dreams Come True | 686,000 | ||
| 10 | "Alone" | B'z | 686,000 |