Abstract: A golf putter alignment device includes a torsion spring clamp that firmly but releasably engages a shaft or a hosel of a golf putter. An elongate positioning rod is disposed within an elongate groove formed in a first arm of the clamp, and a transversely disposed end of a torsion spring overlies the elongate positioning rod to retain it within the elongate groove while allowing the elongate positioning rod to be slideably and rotationally disposed within the elongate groove for positioning purposes. A transversely disposed cradle is secured to a leading end of the elongate positioning rod and receives and supports an elongate alignment rod.