Mario Brega (25 March 1923 – 23 July 1994) was an Italian character actor. His heavy build meant that he regularly portrayed a thug in his films, particularly earlier in his career in westerns. Later in his career, however, he featured in numerous Italian comedy films. Brega stood at 6 feet 4 inches (1.93 m) and well over 250 pounds (110 kg) at his heaviest but after the 1960s slimmed down significantly.

Brega was born in Rome. He was a butcher before he drifted into acting, where his heavy physique ensured him a plethora of character roles. Debuting with director Dino Risi, he then played some minor roles in Sergio Leone's Spaghetti Western movies: A Fistful of Dollars, as Chico; For a Few Dollars More, as Niño; The Good, the Bad and the Ugly as Corporal Wallace; and also as a gangster in Once Upon a Time in America. He appeared in many other Spaghetti Westerns, including Death Rides a Horse, The Great Silence, and My Name is Nobody. Later in his career he had comical roles with director Carlo Verdone, such as in Un sacco bello and Talcum Powder.