Aron Canet dari tim Estrella Galicia 0,0 kembali menjadi yang tercepat pada sesi latihan bebas 3 Moto3 Catalunya 2017, Canet berhasil mencatatkan waktu 1 menit 53.966 detik.
Di belakang Canet ada Enea Bastianini yang merupakan rekan satu timnya di Estrella Galicia 0,0. Bastianini tertinggal 0.032 detik.
Posisi ketiga ditempati oleh Joan Mir, sementara pembalap dari tim Del Conca Gresini Moto3 menyusul di posisi ke 4.
John Mcphee mengamankan posisi ke 5 yang merupakan pembalap dari tim British Talent.
Hasil Latihan Bebas 3 Moto3 Catalunya 2017 :
| Pos. | Pembalap | Tim | Waktu | Km/j | Gap 1st/Prev. |
| 1 | Aron CANET | Estrella Galicia 0,0 | 1’53.966 | 230.8 | |
| 2 | Enea BASTIANINI | Estrella Galicia 0,0 | 1’53.998 | 236.8 | 0.032 / 0.032 |
| 3 | Joan MIR | Leopard Racing | 1’54.035 | 237.8 | 0.069 / 0.037 |
| 4 | Jorge MARTIN | Del Conca Gresini Moto3 | 1’54.293 | 235 | 0.327 / 0.258 |
| 5 | John MCPHEE | British Talent Team | 1’54.341 | 239.3 | 0.375 / 0.048 |
| 6 | Niccolò ANTONELLI | Red Bull KTM Ajo | 1’54.458 | 234.1 | 0.492 / 0.117 |
| 7 | Romano FENATI | Marinelli Rivacold Snipers | 1’54.551 | 228.5 | 0.585 / 0.093 |
| 8 | Gabriel RODRIGO | RBA BOE Racing Team | 1’54.666 | 237.2 | 0.700 / 0.115 |
| 9 | Nicolo BULEGA | SKY Racing Team VR46 | 1’54.735 | 236.3 | 0.769 / 0.069 |
| 10 | Philipp OETTL | Südmetall Schedl GP Racing | 1’54.805 | 236.2 | 0.839 / 0.070 |
| 11 | Darryn BINDER | Platinum Bay Real Estate | 1’54.938 | 234.7 | 0.972 / 0.133 |
| 12 | Fabio DI GIANNANTONIO | Del Conca Gresini Moto3 | 1’54.995 | 236.2 | 1.029 / 0.057 |
| 13 | Marco BEZZECCHI | CIP | 1’55.006 | 232.4 | 1.040 / 0.011 |
| 14 | Bo BENDSNEYDER | Red Bull KTM Ajo | 1’55.023 | 233.5 | 1.057 / 0.017 |
| 15 | Juanfran GUEVARA | RBA BOE Racing Team | 1’55.092 | 238.2 | 1.126 / 0.069 |
| 16 | Tony ARBOLINO | SIC58 Squadra Corse | 1’55.102 | 237.2 | 1.136 / 0.010 |
| 17 | Livio LOI | Leopard Racing | 1’55.140 | 237.3 | 1.174 / 0.038 |
| 18 | Ayumu SASAKI | SIC Racing Team | 1’55.174 | 238.3 | 1.208 / 0.034 |
| 19 | Andrea MIGNO | SKY Racing Team VR46 | 1’55.176 | 235 | 1.210 / 0.002 |
| 20 | Lorenzo DALLA PORTA | Aspar Mahindra Moto3 | 1’55.188 | 234.8 | 1.222 / 0.012 |
| 21 | Marcos RAMIREZ | Platinum Bay Real Estate | 1’55.203 | 235.6 | 1.237 / 0.015 |
| 22 | Tatsuki SUZUKI | SIC58 Squadra Corse | 1’55.213 | 231.1 | 1.247 / 0.010 |
| 23 | Vicente PEREZ | Reale Avintia Academy | 1’55.525 | 231.7 | 1.559 / 0.312 |
| 24 | Jakub KORNFEIL | Peugeot MC Saxoprint | 1’55.694 | 232.5 | 1.728 / 0.169 |
| 25 | Manuel PAGLIANI | CIP | 1’55.943 | 234.4 | 1.977 / 0.249 |
| 26 | Adam NORRODIN | SIC Racing Team | 1’55.944 | 237.1 | 1.978 / 0.001 |
| 27 | Jules DANILO | Marinelli Rivacold Snipers | 1’55.946 | 236.5 | 1.980 / 0.002 |
| 28 | Kaito TOBA | Honda Team Asia | 1’56.093 | 232.3 | 2.127 / 0.147 |
| 29 | Nakarin ATIRATPHUVAPAT | Honda Team Asia | 1’56.229 | 233.8 | 2.263 / 0.136 |
| 30 | Maria HERRERA | AGR Team | 1’56.356 | 234.8 | 2.390 / 0.127 |
| 31 | Aleix VIU | 42 Motorsport | 1’56.907 | 230.7 | 2.941 / 0.551 |
| 32 | Patrik PULKKINEN | Peugeot MC Saxoprint | 1’57.066 | 231.8 | 3.100 / 0.159 |
