Abstract: A gutter guard and locking snap clip for the guard for use with rain gutters in order to prevent leaves and other debris from clogging the outlet of the gutter. The gutter guard is formed with louvre type slots to permit rain to pass therethrough to said gutter for runoff but prevent leaves or other debris from passing through the guard. The guard in one form of the invention is formed with at least one guide groove adjacent the forward edge of the guard. The guide groove is located in a plane below the plane of the adjoining surfaces of said guard and the clip can be moved through the groove. The clip is formed adjacent its leading end with at least one surface irregularity above or below the plane of said leading end, which is adapted to be engaged by or be positioned behind a reversely bent flange of the gutter return bead so as to removably lock the clip, and thus the guard, to the gutter.