Abstract: An illuminatable golf ball includes an outer translucent shell and an inner core portion surrounded by the outer shell. The ball includes a self-contained lighting device formed and contained at least in part within the inner core portion. The lighting device includes an energy source, a pair of lighting elements, and connectors extending between the energy source and the lighting elements defining an electrical circuit. The lighting device includes a switch for energizing and deenergizing the lighting device. The switch can include a plunger insertable into the ball through an opening in the outer shell and through a bore in the inner core portion. The plunger is configured to change the state of the electrical circuit when it is inserted into and removed from the bore to energize and deenergize the lighting elements. The switch can also be of the force actuatable type.