On 20 August 2018, he was revealed as the 2019 Red Bull driver to replace Daniel Ricciardo, who had chosen a future outside the Red Bull family and was given a driver for Renault for 2019. However, his Red Bull Racing was limited to only 12 races since he was demoted to Toro Rosso on August 12 and replaced by Alexander Albon due to his struggles in the first half of 2019. Gazley scored 63 points and no podiums in the first half, which was not even not close to Max Verstappen's total of 181 points and two victories. The French driver only beat his teammate once and only finished ahead of the Dutchman at the British Grand Prix - after Verstappen's RB15 was caught behind Sebastian Vettel's Ferrari. In his first seven races with Toro Rosso, Pierre Gasly performed very well and scored points four times. At the 2019 Brazilian Grand Prix, Gasly's weekend got off to a bad start due to engine problems during FP2. However, he recovered and qualified seventh for the race. A clear penalty for Charles Leclerc at Ferrari meant Gasly started from sixth place. After most of the race, Gasly was on his way to scoring some good points for his team. However, two late car safety periods and a collision between the Ferraris of Leclerc and Sebastian Vettel pushed him towards the podium. With Lewis Hamilton in second place during the second SC period on soft tires, with a few laps remaining Gazley was third, ahead of the champion. On the restart, Hamilton overtook Gasly and was battling Red Bull Albon for second place. As Hamilton attempted to pass Albon from the inside, the two cars made contact and Albon spun. Gazley overtook both and managed to hold off Hamilton's charge by just 0.062 seconds in what was a thrilling battle to the checkered flag.

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