The Frenchman is returning to the French team after finishing second in the championship last year, taking three wins.
Pourchaire is delighted to be racing for ART again this season and is putting all his effort into winning the championship for the team.
He said: “I couldn’t be happier to extend my career in this top-level Formula 2 championship with ART Grand Prix, which has become a family to me.
“We have had intense moments over the past three years and it’s important to prepare for the 2023 championship with a team that knows me and knows how to put me in the best possible situations.
“We may have lacked success last year, but we gained experience that makes us even stronger. I will do everything I can to bring the title to ART Grand Prix this season.”
ART Team Manager Sébastien Philippe said that Pourchaire has matured as a driver and emphasised the importance of the minute details in order to consistently stay at the front of the field.
“Théo will still be one of the youngest drivers on the grid, but he has acquired a technical and personal maturity which, combined with his speed and his combativeness, will be a major asset to be consistently at the front of the field and will help the team in its technical focus.
“Last season showed us how much every detail counts and after two seasons in Formula 2 with Théo, ART Grand Prix’s mission will be to master everything in our power to optimize our chances of winning the title in 2023.”
The 14-round Formula 2 campaign begins of the 3-5 of March in Bahrain and includes a first-ever trip to Albert Park in Australia.