The Fiat 128 is a transverse front-engine, front wheel drive small family car manufactured and marketed by Fiat from 1969 to 1985 as a two- or four-door sedan, three- or five-door station wagon as well as two- or three-door coupé. The 128 running gear and engine, reconfigured for a mid-engined layout, were used in the Fiat X1/9 sports car.

With engineering by Dante Giacosa and engine design by Aurelio Lampredi, the 128 was noted for its relatively roomy passenger and cargo volume — enabled by a breakthrough innovation to the front-engine, front-drive layout which became the layout "adopted by virtually every other manufacturer in the world" for front-wheel drive. Fiat promoted in its advertising that mechanical features consumed only 20% of the vehicle's volume.

Named European Car of the Year in 1970, over three million were utimately manufactured.

In 2012 automotive journalist Jamie Kitman called the 128 a "pioneer of the small cars we drive today."