A golf ball stacking device comprises a hollow, elongated body formed of three panels of clear, flexible plastic sheet material connected together at ends to form a hollow tube having an hourglass shape and a generally triangular cross section. Each panel has relatively wide upper and lower ends and a relatively narrow neck portion positioned between the ends. The neck portions are bowed inwardly to form a relatively narrow arcuate throat for balls to pass between larger upper and lower chambers of the body. The upper chamber comprises an inlet for receiving golf balls. The lower chamber comprises a stacking chamber for stacking the golf balls in a triangular pyramid. The panels are not rigidly connected together at the throat, so that the panels surrounding the throat can flex outwardly to prevent ball clogging in the throat. Slots in the side edges permit manipulation of the balls inside the device. A removable flat tray fits under the body and supports a triangular pyramidal stack of balls on the tray.