Abstract: The golf club grip training aid enables the golfer's hand to be properly positioned with respect to each other while maintaining a comfortable grip on the golf club shaft. The training aid includes a band of flexible material having an aperture for receiving the thumb of a first hand, and an adjustable loop adjacent to the aperture that receives the thumb of the second hand. The adjustable loop accommodates different sizes of thumbs, and preferably includes two loop portions each of which is attached to the band. The two loop portions have mating VELCRO brand hook and loop fasteners which allow the relative positions of the two loop portions to be changed to adjust the loop size. The training aid is also reversible in that it may be used on either hand by moving the loop through a slot in the band that adjoins the loop. When the training aid is to be reversed, the band is wrapped on the second hand and the loop is moved through the slot and adjusted to accommodate the thumb of the first hand.