This is a compilation of 8 United States Guinness records in 1991. You may want to take a look at our complete list of United States Guinness Records broken down by year.
| When | Record name | What | Who |
|---|---|---|---|
| 15 November 1991 | Highest energy particle detected in nature | University of Utah | |
| October 1991 | Largest tumour - removed intact | Professor Katherine O'Hanlan , Douglas J. Ramos, M.D. | |
| October 1991 | Fastest 1,000 miles ultra distance (women) | 12:14:38:40 day(s):hour(s):minute(s):second(s) | Sandra Barwick |
| 25 July 1991 | Fastest run backwards 100 m (male) | 13.6 second(s) | Ferdie Ato Adoboe |
| 31 March 1991 | Most penalties against an individual in an NHL game | Nilan, Chris Nilan | |
| 1984-1987, 1990, 1991, 1997 | Most wins of Female Vocalist of the Year at the Academy of Country Music Awards | Reba McEntire | |
| 1991 | First videogame to improve brain functioning and efficiency | Tetris (Alexey Pajitnov, 1985) | |
| 1991-1997, 2000-2007, 2009 | Most wins of Duo of the Year at the Academy of Country Music Awards | Brooks & Dunn |