| Date: | Thursday, 12 March 2009 |
| Session: | Day 4 (of 4) |
| Track: | Barcelona |
| Track length: | 4.655 km |
| News article: | Barcelona: Barrichello keeps Brawn fastest on day 4 Barcelona: Day 4 team test notes |
| P | Driver | Constructor | Car | T | Time | Gap | Avg Speed | Laps |
| 1 | Rubens Barrichello | Brawn-Mercedes | BGP001 | B | 1:18.926 | 212.325 | 110 | |
| 2 | Nico Rosberg | Williams-Toyota | FW31 | B | 1:19.774 | 0.848 | 210.068 | 120 |
| 3 | Timo Glock | Toyota | TF109 | B | 1:20.091 | 1.165 | 209.237 | 128 |
| 4 | Sebastian Vettel | Red Bull-Renault | RB5 | B | 1:20.576 | 1.650 | 207.978 | 83 |
| 5 | Fernando Alonso | Renault | R29 | B | 1:20.664 | 1.738 | 207.751 | 64 |
| 6 | Felipe Massa | Ferrari | F60 | B | 1:20.677 | 1.751 | 207.717 | 92 |
| 7 | Robert Kubica | BMW Sauber-BMW | F1.09 | B | 1:20.740 | 1.814 | 207.555 | 134 |
| 8 | Lewis Hamilton | McLaren-Mercedes | MP4-24 | B | 1:20.869 | 1.943 | 207.224 | 70 |
| 9 | Sébastien Buemi | Toro Rosso-Ferrari | STR4 | B | 1:21.013 | 2.087 | 206.856 | 62 |
| 10 | Giancarlo Fisichella | Force India-Mercedes | VJM02 | B | 1:21.045 | 2.119 | 206.774 | 141 |
| 11 | Sébastien Bourdais | Toro Rosso-Ferrari | STR4 | B | 1:21.629 | 2.703 | 205.295 | 27 |