Mr Mastro was with Bugatti for almost four years. Previously he spent 14 years with Lamborghini, including five years as general manager of Asia Pacific with responsibility for areas including Australia.
He then moved to become regional manager for EMEA (Europe, Middle East and Africa) before joining Bugatti in 2018.
Prior to Lamborghini he was employed as area manager for Honda in Italy and as business development manager for Italy for Volvo.
During the past three and a half years, while Mr Mastro was working for Bugatti, the Chiron model family has been extended with the Chiron Pur Sport and Chiron Super Sport.
Bugatti also revived its highly successful coachbuilding past with models such as the Divo, La Voiture Noire and Centodieci.
The company said this broad model range brought the company “one record after the other”.
Bugatti president Stephan Winkelmann said: “I want to thank Christian Mastro. With his experience and his outstanding knowledge of the sportscar scene he has made a major contribution to the success story of Bugatti in these past years.
“I have known Christian for many years and appreciate his profound understanding for customers’ needs in the luxury sector. That’s why I am more than happy to continue working with him at Lamborghini.”
Mr Mastro said: “Working for Bugatti, the most prestigious automotive brand in the world, has been a dream come true.
“I am deeply thankful for the experience, but especially for the efforts and the dedication of the entire team: the Bugatti board members, the very motivated sales, marketing, after sales and licensing team, and really every single employee of the brand.”
Volkswagen Group previously owned Bugatti for 24 years. Croatian car-maker Rimac Group bought 55 per cent of Bugatti from Volkswagen in August this year.
Rimac becomes manager and joint owner of Bugatti, with Volkswagen Group retaining 45 per cent through its subsidiary Porsche. Porsche owns 24 per cent of Rimac.
By Neil Dowling