Luca Marini (born 10 August 1997 in Urbino) is an Italian motorcycle racer. He is the maternal half-brother of Valentino Rossi.
Luca Marini, half brother of Valentino Rossi, cut his teeth racing in the Italian CIV series, ending the 2013 CIV Moto3™ championship in fourth with six podium finishes. He moved to the Spanish CEV Moto3™ series in 2014, before in 2015 he moved to the Moto2™ European Championship with the Paginas Amarillas HP 40 Junior team, taking second in just his third race. A run of aggressive rides saw him finish the year in fifth overall, and he was a regular top five contender. 2016 saw the Italian make his full time World Championship debut with the Forward Racing team alongside fellow Italian and VR46 Academy rider Lorenzo Baldassarri, where he remained for 2017. A move to Sky Racing Team VR46 for the 2018 season saw Marini string together his best year yet - claiming five podium finishes, including a maiden Grand Prix win in Sepang.