A pepper mill includes a receiving unit defining a receiving space, a grinding unit disposed at one end of the receiving space, and a stop unit dividing the receiving space into first and second space portions that are respectively distal from and proximate to the grinding unit. The stop unit is formed with a passage to permit peppercorns in the first space portion to fall into the grinding unit so as to be ground thereby through the second space portion when the pepper mill is disposed at a dispensing position, and is configured to stop a portion of residual ground pepper in the second space portion from reaching the first space portion via the passage when the pepper mill is disposed at a non-dispensing position.