A door trim floor gap cover system includes a trim piece operable to cover a gap between a bottom edge of door trim and a walking surface of a flooring material under the door trim (i.e., casing, jamb, and optional door stop). The trim piece may be one piece that bends about the door trim. The trim piece may be a resilient material that deforms while being positioned and is biased toward its original shape to hold onto the door casing. The trim piece may be more than one piece wherein a first portion is positioned on the casing and jamb and the second portion is then interlocked with the first portion to complete the trim piece, covering the floor gap. A pair of hooks extend behind the casing to engage a distal face of the casing, retaining the system against the door trim (casing and jamb).