A golf ball mold includes a pair of split mold sections which are removably mated to define a spherical cavity. The cavity surfaces are provided with a plurality of dimple-forming protrusions. Some of the dimple-forming protrusions are constructed by dimple-forming pins whose inner end has substantially the same shape as the protrusions. The dimple-forming pins are axially or radially movable so that the projection distance of the pins into the cavity is adjustable. With a single mold, golf balls having dimples of different shapes can be produced. Golf balls of quality including symmetry and flight performance can be manufactured at low cost.