Abstract: An adjustable golf putter having a shaft, a putter head and an angle adjusting adapter for adjusting the angle between the shaft and the putter head. The adapter has two sets of a plurality of holes arrayed along two arcs of circle opposite each other into which a pin extending from the lower part of the handle shaft and a pin extending from the rear surface of the putter are inserted respectively to define a preselected shaft to putter head angle such angle being defined by the combination of two of the plurality of holes. The combination of two sets of holes in two arcs of circle allows adjustment of the shaft to putter head angle in increments which are smaller than the distance between two adjacent holes.