1991 Barber Saab Pro Series
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.
Race calendar and results
| Round | Circuit | Location | Date | Winner |
| 1 | Palm Beach International Raceway |  Jupiter, Florida | March 3 |  John Robinson |
| 2 | Bicentennial Park | Miami, Florida | April 7 | John Robinson |
| 3 | Road Atlanta | Braselton, Georgia | April 28 | John Robinson |
| 4 | Lime Rock Park | Lime Rock, Connecticut | May 27 | Bryan Herta |
| 5 | Reunion Arena | Dallas, Texas | June 2 | John Robinson |
| 6 | New Orleans street circuit | New Orleans, Louisiana | June 16 | Bryan Herta |
| 7 | Watkins Glen International | Watkins Glen, New York | June 30 | John Robinson |
| 8 | Mazda Raceway Laguna Seca | Monterey County, California | July 15 | Bryan Herta |
| 9 | Portland International Raceway | Portland, Oregon | July 28 | Bryan Herta |
| 10 | Road America | Elkhart Lake, Wisconsin | August 25 | John Robinson |
| 11 | Road America | Elkhart Lake, Wisconsin | September 22 | Leo Parente |
| 12 | Del Mar Fairgrounds | Del Mar, California | October 13 | John Robinson |
Final standings
| Rank | Driver | PBI | BIC | ATL | LRP | DAL | NOR | WGI | LAG | POR | ROA1 | ROA2 | DMS | Points |
| 1 | Bryan Herta | 3 | 2 | 163 | ||||||||||
| 2 | John Robinson | 1 | 1 | 160 | ||||||||||
| 3 |  Robert Amren | 4 | 21 | 105 | ||||||||||
| 4 | Page Jones | 2 | 10 | 102 | ||||||||||
| 5 | Leo Parente | 19 | 3 | 71 | ||||||||||
| 6 | Barry Waddell | 9 | 23 | 54 | ||||||||||
| 7 | Ross Hockenhull | 8 | 5 | 50 | ||||||||||
| 8 | Mark Tremblay | 5 | 6 | 40 | ||||||||||
| 9 | David Pook | 11 | 22 | 36 | ||||||||||
| 10 |  Tony Leivo | 15 | 4 | 34 | ||||||||||
| Nicke Blom | 9 | |||||||||||||
| John Bostick | 14 | |||||||||||||
| Buzz Calkins | 12 | 19 | ||||||||||||
 Riccardo Dona | 6 | |||||||||||||
| Patrick Hasburgh | 18 | 13 | ||||||||||||
| Stephen Hynes | 16 | |||||||||||||
| Tom Juckette | 16 | |||||||||||||
| Kurt Kossmann | 7 | |||||||||||||
| Nick Kunewalder | 20 | |||||||||||||
| Jeff Laughlin | 15 | |||||||||||||
| Cecil Lepard | 17 | |||||||||||||
| Art Manni Jr. | 11 | |||||||||||||
| Alex Padilla | 13 | 8 | ||||||||||||
| Stan Potter | 10 | |||||||||||||
| Christopher Smith | 18 | |||||||||||||
| Chuck Thomas | 14 | |||||||||||||
| Greg Tracy | 7 | |||||||||||||
| Peter Trigg | 17 | |||||||||||||
| Kimble Williams | 12 |