Jack Aitken (Korean: 한세용, Han Se-yong; born 23 September 1995 in London) is a British-South Korean racing driver who currently competes for Racing Team Turkey in the European Le Mans Series and for Emil Frey Racing in the ADAC GT Masters and the GT World Challenge Europe Endurance Cup. He was a former reserve driver for Williams Racing in Formula One, having previously been part of the Renault Sport Academy and Williams Driver Academy.

Born in London to a Scottish father and South Korean mother, Aitken began his career in karting at Buckmore Park, aged 7. He made the transition to cars when he competed in the Intersteps Championship with Fortec Motorsport, with whom he then went on to race with in the Formula Renault BARC Winter Series, Formula Renault NEC and Formula Renault Eurocup.

After winning the Formula Renault Eurocup in 2015, Aitken was signed up for the Renault young driver academy, with which he remained until 2019. After competing in the GP3 Series in 2016 and 2017 he progressed to Formula 2 for 2018. He has been Williams F1's reserve driver since 2020, and raced for the team at the 2020 Sakhir Grand Prix, replacing George Russell, who, in turn, replaced Lewis Hamilton at Mercedes for the event.