A hand-held device for marking a golf ball has a handle and first and second forks (or arms) for holding the golf ball between the forks. The golf ball is held between a ball-receiving portion of the first fork and a rubber gripper rotationally mounted to the second fork which can be manually turned to rotate the ball between the forks. A spring-loaded marker presses its tip against the ball to inscribe a line as the ball rotates against the tip of the marker. In operation, the device can circumscribe a continuous line around the circumference of the ball without resetting the ball, as well as any arc less than 360 degrees. By resetting the ball perpendicularly after a first arc is inscribed, a second, intersecting arc can be inscribed to define a cross in two easy steps.