| Type: | NC |
| Country: | UK |
| Grand Prix: | BRDC International Trophy |
| Official Name: | XXX BRDC International Trophy |
| Location: | Silverstone Circuit, Northamptonshire |
| Date: | 19 March |
| Year: | 1978 |
| Course: | Permanent racing facility |
| Course Mi: | 2.935 |
| Course Km: | 4.724 |
| Distance Laps: | 40 |
| Distance Mi: | 117.41 |
| Distance Km: | 188.95 |
| Weather: | Heavy rain. |
| Pole Driver: | Ronnie Peterson |
| Pole Country: | Sweden |
| Pole Team: | Lotus-Cosworth |
| Pole Time: | 1:16.07 |
| Fast Driver: | Emerson Fittipaldi |
| Fast Team: | Fittipaldi-Cosworth |
| Fast Time: | 1:38.63 |
| Fast Country: | Brazil |
| First Driver: | Keke Rosberg |
| First Country: | Finland |
| First Team: | Theodore-Cosworth |
| Second Country: | Brazil |
| Second Team: | Fittipaldi-Cosworth |
| Third Driver: | Tony Trimmer |
| Third Country: | UK |
| Third Team: | McLaren-Cosworth |
The XXX BRDC International Trophy was a non-championship motor race for Formula One cars held on 19 March 1978 at the Silverstone Circuit, England. It was the 30th running of the International Trophy, and the last to non-Championship Formula One regulations. The race was held over 40 laps of the Silverstone circuit, for a total distance of around 189km (117miles).
Although qualifying sessions had been dry, the race was run in torrential rain, resulting in multiple accidents and drivers spinning off. The race was eventually won by Keke Rosberg, his first victory in a Formula One car in only his second ever Formula One race.
| Pos. | No. | Driver | Constructor | Q1 | Q2 | Gap | |
|---|---|---|---|---|---|---|---|
| 1 | 6 |  Ronnie Peterson | Lotus-Ford | 1:16.85 | 1:16.07 | — | |
| 2 | 1 |  Niki Lauda | Brabham-Alfa Romeo | 1:17.47 | 1:16.43 | +0.36 | |
| 3 | 5 |  Mario Andretti | Lotus-Ford | 1:16.60 | 1:17.19 | +0.53 | |
| 4 | 7 | James Hunt | McLaren-Ford | 1:16.85 | 1:17.18 | +0.78 | |
| 5 | 30 | Brett Lunger | McLaren-Ford | 1:19.13 | 1:17.77 | +1.70 | |
| 6 | 3 |  Patrick Depailler | Tyrrell-Ford | 1:18.64 | 1:17.98 | +1.91 | |
| 7 | 16 |  Hans Stuck Jr. | Shadow-Ford | 1:21.48 | 1:18.15 | +2.08 | |
| 8 | 14 |  Emerson Fittipaldi | Fittipaldi-Ford | 1:18.44 | 1:18.92 | +2.37 | |
| 9 | 38 |  Derek Daly | Hesketh-Ford | 1:19.57 | 1:18.88 | +2.81 | |
| 10 | 18 | Rupert Keegan | Surtees-Ford | 1:18.96 | 1:19.10 | +2.89 | |
| 11 | 32 |  Keke Rosberg | Theodore-Ford | 1:19.03 | 1:19.54 | +2.96 | |
| 12 | 28 |  Emilio de Villota | McLaren-Ford | 1:19.85 | 1:19.36 | +3.29 | |
| 13 | 22 |  Jacky Ickx | Ensign-Ford | 1:21.18 | 1:20.00 | +3.93 | |
| 14 | 31 | René Arnoux | Martini-Ford | 1:20.34 | 1:20.09 | +4.02 | |
| 15 | 40 | Tony Trimmer | McLaren-Ford | 1:20.51 | 1:20.43 | +4.36 | |
| 16 | 17 |  Clay Regazzoni | Shadow-Ford | 1:20.63 | 1:21.26 | +4.56 | |
| DNQ | 24 | Divina Galica | Hesketh-Ford | 1:28.45 | 1:23.07 | +7.00 | |
| Source:[1] | |||||||
