Sergey Olegovich Sirotkin (Russian: Серге́й Оле́гович Сиро́ткин, IPA: [sʲɪrˈɡʲej ɐˈlʲeɡəvʲɪtɕ sʲɪˈrotkʲɪn]; born 27 August 1995) is a Russian racing driver, who most recently competed in the 2023–24 Middle East Trophy for SMP. Sirotkin competed in Formula One in 2018.

Born and raised in Moscow, Sirotkin is the son of Oleg Sirotkin, former head of the NIAT in Russia. He began karting aged 12 before graduating to Formula Abarth in 2010, winning the European Championship and finishing runner-up in the Italian Championship the following season. After competing in Italian Formula 3 and Formula Renault 3.5, Sirotkin progressed to the GP2 Series with Rapax in 2015. Sirotkin twice finished third in the GP2 standings with Rapax and ART, taking several wins across his two full seasons in the series. Following this—having already served as a test driver for Sauber—Sirotkin was promoted to reserve driver at Renault in 2017. After impressing at the Yas Marina post-season test, Sirotkin signed for Williams in 2018, replacing Felipe Massa to partner Lance Stroll and making his Formula One debut at the Australian Grand Prix. He scored his maiden points finish in Italy, but was dropped by Williams at the end of the season after SMP withdrew his sponsorship due to performance concerns with the FW41. Sirotkin returned as a reserve driver for Renault and McLaren in 2019, remaining at the former for 2020 before his departure.

Since leaving Formula One, Sirotkin has moved into sportscar racing, competing in the FIA World Endurance Championship, GT World Challenge Europe, Intercontinental GT Challenge and the Middle East Trophy for SMP.