A mounting apparatus for a fan includes an accommodating member, a bracket rotatably received in the accommodating member, a latching tab contractively exposed through the bracket, and a torsion spring. The accommodating member defines a latching hole for the latching tab. The torsion spring is connected between the accommodating member and the bracket. The fan is mounted to and received in the bracket. When the bracket is rotated to a predetermined position in the accommodating member, the latching tab is latched in the latching hole, and the torsion spring is deformed, these two elements operate to absorb and nullify any vibration from the working fan.