Isack Alexandre Hadjar (born 28 September 2004) is a French and Algerian racing driver, who is contracted to compete under the French flag in Formula One for Racing Bulls.
A member of the Red Bull Junior Team since 2022, Hadjar signed for Racing Bulls in 2025, replacing Liam Lawson to partner Yuki Tsunoda. Hadjar is contracted to remain at Racing Bulls until at least the end of the 2025 season.