A pepper mill includes a receiving unit, a grinding unit, a coupling unit and a closure unit. The receiving unit includes a container body defining a receiving space for receiving peppercorns, and a driving member disposed movably in the receiving space. The coupling unit is disposed in the receiving space and is driven rotatably by the driving member. The grinding unit is disposed in the receiving space and is coupled co-rotatably to the coupling unit for grinding the peppercorns to result in ground pepper. The closure unit includes a closure member movable relative to the grinding unit between a closed position so as to block discharge of the ground pepper through a discharge end of the container body, and an opened position so as to permit discharge of the ground pepper through the discharge end.