A mounting apparatus for a fan, configured for securing the fan, includes a plate. The plate further includes a main body. The main body defines a ventilation area corresponding to the fan. At least two latching pieces and at least one protrusion extend from main body. The at least two latching pieces and the at least one protrusion are around the ventilation are. The at least two latching pieces is engaged with two opposite sides of the mounting board for preventing the fan from moving a first direction, a second direction opposite, and a third direction substantially perpendicular to the main body; and the at least one protrusion abuts the mounting board to prevent the fan from rotating in a fourth direction which the mounting board is disengaged from the at least two latching pieces.