Sebastian Vettel led a Ferrari 1-2 in final practice for the Singapore Grand Prix, with team-mate Kimi Raikkonen over half a second adrift as Mercedes could only manage fifth and sixth behind the Red Bull duo.
2015 Singapore Grand Prix Practice Times (FP3):
| # | Driver | Team | Time | Gap | Laps |
| 01 | Sebastian Vettel | Ferrari | 1:45.682 | – | 12 |
| 02 | Kimi Raikkonen | Ferrari | 1:46.132 | 0.450 | 12 |
| 03 | Daniil Kvyat | Red Bull | 1:46.167 | 0.485 | 19 |
| 04 | Daniel Ricciardo | Red Bull | 1:46.359 | 0.677 | 14 |
| 05 | Lewis Hamilton | Mercedes | 1:46.802 | 1.120 | 15 |
| 06 | Nico Rosberg | Mercedes | 1:47.223 | 1.541 | 16 |
| 07 | Fernando Alonso | McLaren | 1:47.237 | 1.555 | 14 |
| 08 | Carlos Sainz | Toro Rosso | 1:47.301 | 1.619 | 18 |
| 09 | Max Verstappen | Toro Rosso | 1:47.464 | 1.782 | 17 |
| 10 | Marcus Ericsson | Sauber | 1:47.568 | 1.886 | 20 |
| 11 | Valtteri Bottas | Williams | 1:47.587 | 1.905 | 20 |
| 12 | Nico Hulkenberg | Force India | 1:47.640 | 1.958 | 16 |
| 13 | Jenson Button | McLaren | 1:47.715 | 2.033 | 14 |
| 14 | Felipe Massa | Williams | 1:47.733 | 2.051 | 21 |
| 15 | Pastor Maldonado | Lotus | 1:47.817 | 2.135 | 16 |
| 16 | Sergio Perez | Force India | 1:48.002 | 2.320 | 15 |
| 17 | Romain Grosjean | Lotus | 1:48.116 | 2.434 | 15 |
| 18 | Felipe Nasr | Sauber | 1:48.932 | 3.250 | 20 |
| 19 | Alexander Rossi | Marussia | 1:52.588 | 6.906 | 26 |
| 20 | Will Stevens | Marussia | 1:55.293 | 9.611 | 22 |
