The 1991 Barber Saab Pro Series season was the fifth season of the series. This was the first season the class had a title sponsor, Zerex. All drivers used Saab powered Goodyear shod Mondiale chassis. Bryan Herta won the championship.
| Round | Circuit | Location | Date | Winner |
|---|---|---|---|---|
| 1 | Palm Beach International Raceway | | March 3 | |
| 2 | Bicentennial Park | | April 7 | |
| 3 | Road Atlanta | | April 28 | |
| 4 | Lime Rock Park | | May 27 | |
| 5 | Mid-Ohio Sports Car Course | | June 2 | |
| 6 | New Orleans street circuit | | June 16 | |
| 7 | Watkins Glen International | | June 30 | |
| 8 | Mazda Raceway Laguna Seca | | July 15 | |
| 9 | Portland International Raceway | | July 28 | |
| 10 | Road America | | August 25 | |
| 11 | Road America | | September 22 | |
| 12 | Del Mar Fairgrounds | | October 13 | |
| Color | Result |
|---|---|
| Gold | Winner |
| Silver | 2nd place |
| Bronze | 3rd place |
| Green | 4th & 5th place |
| Light Blue | 6th–10th place |
| Dark Blue | 11th place or lower |
| Purple | Did not finish |
| Red | Did not qualify (DNQ) |
| Brown | Withdrawn (Wth) |
| Black | Disqualified (DSQ) |
| White | Did not start (DNS) |
| Blank | Did not participate (DNP) |
| Driver replacement (Rpl) | |
| Injured (Inj) | |
| No race held (NH) |
| Rank | Driver | PBI | BIC | ATL | LRP | DAL | NOR | WGI [2] | LAG | POR | ROA1 | ROA2 | DMS [3] | Points |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | | 3 | 2 | 163 | ||||||||||
| 2 | | 1 | 1 | 160 | ||||||||||
| 3 | | 4 | 21 | 105 | ||||||||||
| 4 | | 2 | 10 | 102 | ||||||||||
| 5 | | 19 | 3 | 71 | ||||||||||
| 6 | | 9 | 23 | 54 | ||||||||||
| 7 | | 8 | 5 | 50 | ||||||||||
| 8 | | 5 | 6 | 40 | ||||||||||
| 9 | | 11 | 22 | 36 | ||||||||||
| 10 | | 15 | 4 | 34 | ||||||||||
| | 9 | |||||||||||||
| | 14 | |||||||||||||
| | 12 | 19 | ||||||||||||
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| | 18 | 13 | ||||||||||||
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| | 13 | 8 | ||||||||||||
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| | 12 |