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Marc Marquez mendominasi sesi latihan bebas ke-3 MotoGP Austria. Sementara itu Valentino Rossi dipaksa untuk ambil bagian dalam kualifikasi pertama.
FP3 diadakan dalam kondisi lembab dan kering dengan mayoritas pembalap memulai dengan ban basah dan Jorge Lorenzo mendominasi diawal sesi. Ketika lintasan mulai mengering Marquez memimpin. Saat sesi akan berakhir Marquez makin mempertajam catatannya denga waktu 1 m 26.396 detik dan berjarak 1.7 detik dari posisi kedua. Berikut hasil lengkap FP3 MotoGP Austria 2018:
| Pos | Rider | Team | Bike | Time | Gap | Laps |
|---|---|---|---|---|---|---|
| 1 | Marc Marquez | Honda | Honda | 1m26.496s | – | 8 |
| 2 | Bradley Smith | KTM | KTM | 1m28.280s | 1.784s | 11 |
| 3 | Scott Redding | Aprilia | Aprilia | 1m28.478s | 1.982s | 14 |
| 4 | Cal Crutchlow | LCR Honda | Honda | 1m28.653s | 2.157s | 14 |
| 5 | Thomas Luthi | MVDS Honda | Honda | 1m28.744s | 2.248s | 19 |
| 6 | Jack Miller | Pramac Ducati | Ducati | 1m28.967s | 2.471s | 12 |
| 7 | Andrea Dovizioso | Ducati | Ducati | 1m29.008s | 2.512s | 10 |
| 8 | Alex Rins | Suzuki | Suzuki | 1m29.014s | 2.518s | 15 |
| 9 | Hafizh Syahrin | Tech3 Yamaha | Yamaha | 1m29.206s | 2.710s | 14 |
| 10 | Maverick Vinales | Yamaha | Yamaha | 1m29.208s | 2.712s | 21 |
| 11 | Xavier Simeon | Avintia Ducati | Ducati | 1m29.762s | 3.266s | 14 |
| 12 | Karel Abraham | Aspar Ducati | Ducati | 1m30.255s | 3.759s | 19 |
| 13 | Johann Zarco | Tech3 Yamaha | Yamaha | 1m30.390s | 3.894s | 20 |
| 14 | Jorge Lorenzo | Ducati | Ducati | 1m30.687s | 4.191s | 10 |
| 15 | Valentino Rossi | Yamaha | Yamaha | 1m31.375s | 4.879s | 22 |
| 16 | Alvaro Bautista | Aspar Ducati | Ducati | 1m31.644s | 5.148s | 19 |
| 17 | Dani Pedrosa | Honda | Honda | 1m32.239s | 5.743s | 13 |
| 18 | Takaaki Nakagami | LCR Honda | Honda | 1m32.363s | 5.867s | 19 |
| 19 | Franco Morbidelli | MVDS Honda | Honda | 1m32.451s | 5.955s | 17 |
| – | Danilo Petrucci | Pramac Ducati | Ducati | 1m34.465s | 7.969s | 7 |
| – | Andrea Iannone | Suzuki | Suzuki | 1m35.186s | 8.690s | 5 |
| – | Aleix Espargaro | Aprilia | Aprilia | 1m38.257s | 11.761s | 3 |
| – | Tito Rabat | Avintia Ducati | Ducati | – | – | 0 |