Since 1923, the quadrifoglio logo (also called the 'cloverleaf') has been the symbol of Alfa Romeo racing cars and since WWII, it has also been used to designate the higher trim models of the range. The quadrifoglio is usually placed on the side panels of the car, above or behind the front wheels—on the front wings in the case of modern vehicles. The logo consists of a green cloverleaf with four leaves, contained with a white triangle.

The quadrifoglio has been used on Alfa Romeo cars since the death of Ugo Sivocci in 1923. As a friend of Enzo Ferrari, Sivocci was hired by Alfa Romeo in 1920 to drive in the three-man works team—Alfa Corse—with Antonio Ascari and Enzo Ferrari.