The first of the two Saturday practice sessions for the 2005 Brazilian Grand Prix would see Antonio Pizzonia finish in an encouraging seventh but team-mate Mark Webber was down in thirteenth.

The start of the third practice session for the Brazilian Grand Prix would see Albers, Karthikeyan, Monteiro, and Montoya all take to the track for their installation lap. They would be joined by Robert Doornbos and Kimi Raikkonen.
They would all return to their pits leaving the track empty. Sato and  Villeneuve would also complete their installation lap. With thirty five minutes remaining no times had been set. With thirty minutes left in the session it would be Sauber's Jacques Villeneuve who would look to set a time but he would abort his run returning to his pit recording no time.

Red Bull's Christian Klein was out for his installation lap. But the Austrian would start a flying lap and would cross the line with a time of 1m:15.060. Fisichella, Montoya, Karthikeyan, and Ralf Schumacher were also on the track. Klein's next lap was a 1m:14.051.

Giancarlo would start his first flying lap and was fastest in the first
sector. Giancarlo would finish with a time of 1m:13.507 to be fastest. Montoya would move into second with a 1m:13.676, while Klein was third and Ralf
Schumacher fourth. On his next lap Giancarlo would set a time of 1m:12.789. Albers was sixth with a 1m:17.315. Juan Pablo would lower his time with a 1m:13.113. Alonso was also on the track joined by Michael Schumacher.
Fisichella had returned to his pit.

Trulli would move into sixth with a time of 1m:16.610. The second Ferrari of Barrichello was also out. Alonso would go fastest with a time of 1m:12.738. Michael was in sixth with a time of 1m:14.825. Trulli would move ahead of Michael with a time of 1m:14.308. Button was also out. Alonso and Montoya had returned to their pits. Michael was now in fourth with a 1m:13.952. Rubens was now in eighth with a 1m:14.765.

Sato had joined team-mate Button on the track. Jenson's first timed lap would see him in eighth with a time of 1m:14.508. Rubens would move ahead of Jenson with a 1m:14.231, while Sato was in tenth with a 1m:14.513. Button's next lap would see him jump up to fourth with a time of 1m:13.856. Both BMW WilliamsF1 drivers were now out on the track, with ten minutes left in the session. There were only two other drivers on the track at this time. Sato was now in ninth with a time of 1m:14.139.

Mark and Antonio would start their first flying laps. Mark's first lap would see him set a time of 1m:15.056 to be twelfth. Antonio would push Mark down one place by taking twelfth with a time of 1m:14.939. Button would improve his time with a 1m:13.486, but was still in fourth. Mark's next lap saw him set a time of 1m:14.466 to be eleventh. Jenson would take a few tenths off his time with a 1m:13.186. Mark had set a time of 1m:14.259.

Massa would move into twelfth with a time of 1m:14.756. Villeneuve was in fifteenth with a time of 1m:15.163. With five minutes remaining there would be the usual flood of cars taking to the track. Coulthard was now in twelfth with a time of 1m:14.401. The only driver yet to set a time was Raikkonen. Trulli was now fifth with a 1m:13.945. Mark was now in tenth with a 1m:14.112. Kimi's first lap would see him in fifth with a time of 1m:13.424. Mark was now in eleventh while Antonio would move into sixth from fifteenth. His time was a 1m:13.795. Mark had returned to his pit.

Montoya would close the gap to Renault's with a 1m:13.050, but remained in third. Antonio had also returned to his pit as the session came to a close. But Rubens would push the WilliamsF1 driver down one place when he moved into sixth with a time of 1m:13.529.