Marcos Siebert (born 16 March 1996 in Mar del Plata) is an Argentine racing driver. He currently competes at the 2025 GT World Challenge Europe Sprint Cup for AF Corse with a Ferrari 296 GT3. Siebert won the LMP3 drivers title at the 2023 European Le Mans Series.
Born in Mar del Plata, Siebert began karting in 2004 at the age of eight, his highlights of his karting career being a second and third at the 2005 and 2006 editions of the Promocional karting events.
Siebert graduated to single-seaters in 2011, spending two seasons in Formula Metropolitan, finishing 12th in the 2012 season. The following year, Siebert moved to the Formula Renault 2.0 series with Jenzer Motorsport, finishing 24th in both that year's editions of the Eurocup and Alps series.
After a year out of motorsport, Siebert reunited with Jenzer in 2015 to partake in the Italian F4 Championship. In his first season, he claimed two victories and finished fifth in the standings. He remained with Jenzer for the 2016 season and claimed the championship ahead of Mick Schumacher.
In 2015, Siebert joined Jenzer for the post-season test at Yas Marina and to act as their reserve driver for 2016. In November 2016, Siebert once again took part in post-season testing with Jenzer and Trident Racing. In March 2017, Siebert joined Campos Racing for the pre-season test at Estoril.
<sup>â </sup> As Siebert was a guest driver, he was ineligible for points. <sup>*</sup> Season still in progress.
() (Races in bold indicate pole position; races in italics indicate fastest lap)
() (Races in bold indicate pole position; races in italics indicate fastest lap)
() (Races in bold indicate pole position) (Races in italics indicate fastest lap)
() (Races in bold indicate pole position) (Races in italics indicate fastest lap)
() (Races in bold indicate pole position; races in italics indicate points for the fastest lap of top ten finishers)
() (Races in bold indicate pole position; races in italics indicate points for the fastest lap of top ten finishers)
() (Races in bold indicate pole position; results in italics indicate fastest lap)
() (Races in bold indicate pole position) (Races in italics indicate fastest lap)
() (Races in bold indicate pole position) (Races in italics indicate fastest lap)