Luca Marini (born 10 August 1997 in Urbino) is an Italian motorcycle racer. He is the maternal half-brother of Valentino Rossi.
Marini made his début in the Moto3 World Championship at the 2013 San Marino and Rimini's Coast motorcycle Grand Prix as a wildcard, failing to finish the race. In 2015 he got another wildcard entry at the same place, this time in the Moto2 class with Pons Racing Junior Team aboard a Kalex, finishing the race in 21st place.
For 2016 Marini was signed by the Forward Team to compete full-time in the same class; he got his first Grand Prix points in Qatar, where he finished in 10th place, and his best result in Germany, where he had a 6th place. Marini still remained with the team for 2017.