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| Date | Sunday 24 March 1991 |
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| Start time | 14:00 |
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| Event |  Brazilian GP |
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| Circuit | Interlagos |
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| Event Format | Race of 71 laps |
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| Championship | World Championship |
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| Race number | #2 of 16 in 1991
#502 (of all time) |
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| Laps | 71 |
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| Circuit Perimeter | 4325 m |
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| Race Distance | 4325 × 71 = 307.075 km |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Left |
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| First Corner | Left |
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| Track Direction | Anti-clockwise |
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| Weather | Overcast, Mild, Wet |
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| Entries | 34 |
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| Qualifiers | 26 |
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| Finishers | 13 |
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| Debutants | None |
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| Milestones | Canon Williams Team – 100th Race Entry (Entrant)
Honda Marlboro McLaren – 100th Race Entry (Entrant)
Mauricio Gugelmin – 50th Race Entry (Driver)
 AGS – 100th Race Entry (Car Manufacturer)
 Gabriele Tarquini – 50th Race Entry (Driver)
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| Records Broken |
1. Most Laps Led – Ayrton Senna (2260)
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| Records Extended |
1. Most Drivers' Championship Points Scores – Ferrari (554),
2. Most Constructors' Championship Points Scores – Ferrari (422),
3. Most Constructors' Championship Points Scores – Alain Prost (110),
4. Most Drivers' Championship Points Scores – Alain Prost (110),
5. Most 4th Place Finishes – Ferrari (100),
6. Most 6th Place Finishes – Ferrari (59),
7. Most 12th Place Finishes –  Brabham (25),
8. Most Race Entries – Lotus (1208),
9. Most Race Entries – Riccardo Patrese (211),
10. Most Poles – Ayrton Senna (54),
11. Most 3rd Place Qualifications – Nigel Mansell (25),
12. Most 5th Place Qualifications – Ferrari (112),
13. Most 6th Place Qualifications – Ferrari (93)
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