AMA Superbike leading entries for 1991:
| no. | rider | entrant | bike |
| 2 | Jamie James USA | Team Vance & Hines Yamaha | Yamaha |
| 11 | Thomas Stevens USA | Team Vance & Hines Yamaha | Yamaha OW01 |
| Larry Schwarzbach USA | Team Vance & Hines Yamaha | Yamaha | |
| 3 | Mike Baldwin USA | Two Brothers Racing | Honda RC30 |
| 19 | Freddie Spencer USA | Two Brothers Racing | Honda RC30 |
| 91 ? | Steve Crevier CAN | Two Brothers Racing | Honda |
| 16 | Tom Kipp USA | Team Wiseco | Yamaha OW01 |
| 22 | Scott Russell USA | Team Muzzy Kawasaki | Kawasaki ZXR |
| 39 ? | Jacques Guenette Jr CAN | Team Muzzy Kawasaki | Kawasaki ZXR |
| 23 | Doug Polen USA | Team Fast By Ferracci Ducati Corse USA | Ducati 851 |
| 34 | Pascal Picotte CAN* | Team Fast By Ferracci Ducati Corse USA | Ducati |
| 32 | Dale Quarterley USA | Honda | |
| 34 | Pascal Picotte CAN* | Yamaha of Canada | Yamaha OW01 |
| Tommy Lynch USA | Yoshimura Suzuki | Suzuki GSX-R | |
| 68 | Mike Smith USA | Yoshimura Suzuki | Suzuki GSX-R |
| Richard Arnaiz USA | Commonwealth Racing | Honda RC30 | |
| 97 | Miguel DuHamel CAN | Commonwealth Racing | Honda RC30 |
| Jimmy Adamo USA | Ducati | ||
| Linnley Clarke CAN | Yamaha | ||
| Christian Gardner | ? | ||
| Brad Hazen USA | Yamaha | ||
| John Hopperstad USA | Yamaha | ||
| Eric Moe USA | ? | ||
| Rueben McMurter CAN | Honda | ||
| Joe Brett Williams USA | Honda |
* Picotte transferred from Yamaha to Ducati after round two
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