A parcel drop box for receiving a parcel in the presence or absence of a receiver of the parcel. The parcel drop box includes a cuboidal enclosure with an open-top. A lid pivotally covers the open-top and can be lifted for gaining access into the interior of the enclosure. A pair of flaps coupled inside the enclosure to the sidewalls and just below a periphery of the open-top. The flaps can pivot between a horizontal position and a downward vertical position. The lid is coupled to the pair of flaps, such as pivoting of the lid results in pivoting of the flaps. Opening of the lid results in pivoting of the flaps to a horizontal position which restricts the access to the interior of the enclosure from the open-top i.e., the pair of flaps substantially cover the open-top when in the horizontal position.