Abstract: A golf stroke alignment aid of particular use during putting, comprises a rectangular marker on the ball (2) and one or more similar markers on the club (2a, 2b, 2c) so as to be visible by the player from above. Each rectangular marker has a forward line of increased thickness (4, 4a, 4b, 4c) relative to that of other lines defining the rectangle. By aligning the marker(s) on the club with that on the ball improved visual alignment and visual memorising is obtained to assist in squaring the club face at impact.