Nico Rosberg snatched the advantage in first practice for the Singapore Grand Prix to go quickest for Mercedes, with team-mate Lewis Hamilton trailing in second by over three-tenths.
2015 Singapore Grand Prix Practice Times (FP1):
| # | Driver | Team | Time | Gap | Laps |
| 01 | Nico Rosberg | Mercedes | 1:47.995 | – | 27 |
| 02 | Lewis Hamilton | Mercedes | 1:48.314 | 0.319 | 24 |
| 03 | Daniel Ricciardo | Red Bull | 1:48.331 | 0.336 | 21 |
| 04 | Sebastian Vettel | Ferrari | 1:48.494 | 0.499 | 23 |
| 05 | Kimi Raikkonen | Ferrari | 1:48.785 | 0.790 | 20 |
| 06 | Valtteri Bottas | Williams | 1:49.380 | 1.385 | 19 |
| 07 | Max Verstappen | Toro Rosso | 1:49.466 | 1.471 | 17 |
| 08 | Nico Hulkenberg | Force India | 1:49.854 | 1.859 | 21 |
| 09 | Carlos Sainz | Toro Rosso | 1:50.019 | 2.024 | 28 |
| 10 | Pastor Maldonado | Lotus | 1:50.068 | 2.073 | 21 |
| 11 | Fernando Alonso | McLaren | 1:50.123 | 2.128 | 21 |
| 12 | Sergio Perez | Force India | 1:50.125 | 2.130 | 23 |
| 13 | Felipe Nasr | Sauber | 1:50.158 | 2.163 | 18 |
| 14 | Romain Grosjean | Lotus | 1:50.341 | 2.346 | 23 |
| 15 | Jenson Button | McLaren | 1:50.455 | 2.460 | 21 |
| 16 | Marcus Ericsson | Sauber | 1:50.883 | 2.888 | 21 |
| 17 | Felipe Massa | Williams | 1:51.035 | 3.040 | 18 |
| 18 | Daniil Kvyat | Red Bull | 1:51.188 | 3.193 | 8 |
| 19 | Will Stevens | Marussia | 1:53.903 | 5.908 | 20 |
| 20 | Alexander Rossi | Marussia | 1:53.918 | 5.923 | 18 |
