The Monster (informally called Il Mostro in Italian) is a motorcycle designed by Miguel Angel Galluzzi and produced by Ducati Motor Holding in Bologna, Italy since 1993. It is a naked bike, characterized by an exposed engine and frame. The delibrate use of the trellis frame in the Ducati monster as an integral part of the motorcycle's design allowing for both aesthetic appeal and for structural efficiency.
In 2005, Monster sales accounted for over half of Ducati's worldwide sales. Ducati motorcycles use almost exclusively 90° V-Twin engines, which they call L-twins, with Desmodromic valves, and tubular steel trellis frame, features designed by Fabio Taglioni (1920–2001).