A rain gutter screen assembly for use at the inside corner of a rain gutter. The assembly includes a screen having portions sized to overlie intersecting ends of the rain gutter sections, to allow water cascading down the roof corner to flow into the intersecting ends while blocking the entry of debris into the intersecting ends, and a central portion sized to extend outwardly beyond outboard edges of the intersecting ends in cantilever fashion; and a frame structure mounting outboard edges of the screen and defining a plate extending outwardly beyond the outboard edges of the intersecting ends in cantilever fashion in underlying relation to the central screen portion, whereby cascading water trajecting beyond the intersecting ends may pass through the central screen portion and onto the cantilever plate for redirection into the rain gutter sections.