Diego Romanini (born 30 December 1978 in Pietrasanta) is an Italian auto racing driver.
He has competed in the World Touring Car Championship and was the Austria Formula 3 Cup champion in 2001 and 2003.
He spent one year in the British Formula 3 Championship, then returned to the Austrian series in 2003, where he regained his title.
For 2006 he got a drive in the FIA World Touring Car Championship for the independent Wiechers-Sport Team, in a BMW 320i.
Romamini will drive for Proteam Racing from the second round of the 2013 European Touring Car Cup season in Slovakia in a BMW 320si with the option of joining the team for future WTCC events.