The Charlie's Angels star is currently single after dating a string of hunky Americans, including Justin Timberlake, Jared Leto and Alex Rodriguez, but reveals she may look across the pond for her next romance.
Diaz reveals she is impressed by British manners, and sees Firth as the epitome of an English gent.
She tells Harper's Bazaar magazine, "I love (British men's) sense of humour and the sense of chivalry and charm. It's something that is innately a part of the culture - it's not the same in America.
"He's (Firth) the perfect Englishman. Just enough of the self-effacing to a point that it's comfortable for other people, but also totally charming and engaging to where he makes you feel special. He's got that British honesty.
"I love the Brits - I always have. I have a weak spot for them. I grew up on Monty Python. I love Little Britain. My grandfather used to watch Benny Hill all the time."