An adjustable-volume liquid dispenser is disclosed. In one embodiment, an adjustable-volume liquid dispenser includes a spout and a plunger secured to the spout. The dispenser further includes a plunger lock moveable lengthwise along the plunger. The plunger lock is securable to the plunger at a plurality of positions on the plunger to adjust a volume of liquid to be dispensed. The dispenser also includes a spring in contact with the plunger. In addition, the dispenser includes a chamber comprising an interior for containing liquid. The plunger is slidably arranged with the chamber. A portion of the plunger is disposed within the chamber. Moreover, the dispenser includes a chamber cap secured to the chamber, and a valve disposed within the chamber. The dispenser also includes a shaft secured to the chamber.