A laser assembly is removably attached to the shaft of a putter slightly above the head. The position and orientation of the laser assembly is adjusted to direct the laser horizontally in a plane passing through the sweet spot of the putter's face and perpendicular to the face when a user is addressing a golf ball with the putter. Once adjusted, the laser then can give accurate indications, against a backdrop, of the alignment of the putter with respect to a selected target hole, because the laser will illuminate a spot on the backdrop which is in accurate alignment with the putter, and thus allowing the golfer to compare his or her alignment prior to activating the laser. The laser is preferably momentarily actuated by a finger button attached to the putter at or near the grip.