This page lists the World Best Year Performances in the year 1991 in the hammer throw for both men and women. One of the main events during this season were the World Championships in Tokyo, Japan, where the final of the men's competition was held on Sunday August 25, 1991.
| Rank | Mark | Athlete | Venue | Date | Note | |
|---|---|---|---|---|---|---|
| 1 | 84.26 m | 03.07.1991 | PB | |||
| 2 | 82.80 m | 11.07.1991 | ||||
| 3 | 82.62 m | 03.07.1991 | ||||
| 4 | 82.40 m | 01.06.1991 | NR | |||
| 5 | 81.16 m | 05.05.1991 | ||||
| 6 | 81.14 m | 01.06.1991 | PB | |||
| 7 | 80.72 m | Nyíregyháza, Hungary | 02.06.1991 | |||
| 8 | 80.62 m | 21.06.1991 | PB | |||
| 80.62 m | 11.07.1991 | |||||
| 10 | 80.56 m | 26.07.1991 | ||||
| 11 | 80.44 m | 25.08.1991 | ||||
| 12 | 79.78 m | 26.07.1991 | PB | |||
| 13 | 79.76 m | Rhede, Germany | 07.07.1991 | |||
| 14 | 79.42 m | Leverkusen, Germany | 12.07.1991 | |||
| 15 | 79.24 m | Modesto, California, United States | 11.05.1991 | |||
| 16 | 79.16 m | 26.07.1991 | ||||
| 17 | 78.62 m | 01.08.1991 | ||||
| 18 | 78.44 m | Eugene, Oregon, United States | 21.06.1991 | PB | ||
| 19 | 78.12 m | 29.09.1991 | NR | |||
| 20 | 78.10 m | 03.07.1991 | ||||
| 21 | 78.00 m | 11.05.1991 | ||||
| 22 | 77.90 m | State College, United States | 09.07.1991 | |||
| 23 | 77.80 m | 10.08.1991 | ||||
| 24 | 77.60 m | 01.08.1991 | ||||
| 25 | 77.44 m | 26.06.1991 |
| Rank | Mark | Athlete | Venue | Date | Note | |
|---|---|---|---|---|---|---|
| 1 | 64.44 m | 24.02.1991 | PB | |||
| 2 | 63.08 m | 24.02.1991 | PB | |||
| 3 | 61.80 m | 18.06.1991 | PB | |||
| 4 | 61.66 m | 01.06.1991 | PB | |||
| 5 | 61.52 m | 26.05.1991 | PB | |||
| 6 | 58.60 m | 26.05.1991 | PB | |||
| 7 | 56.72 m | 25.05.1991 | ||||
| 8 | 56.48 m | Antony, France | 03.07.1991 | PB | ||
| 9 | 55.22 m | 24.02.1991 | PB | |||
| 10 | 52.10 m | unknown | ??.??.0000 | PB | ||
| 11 | 47.14 m | unknown | ??.??.0000 | PB |