Abstract: A liner for a rain gutter and the like comprises a sheet of rigid material which fits independently down inside a gutter underneath any cross-pieces to form an upper longitudinally extending barrier surface and a lower longitudinally extending liquid passageway. The horizontal plane of the liner is bent to form an angle with a short plane which rests against the bottom and front wall of the gutter and a long plane which rests against the upper portion of the rear wall of the utter. In this position, the liner sets above the bottom of the gutter at an angle that slopes down and away from the roof structure. The barrier surface of the liner has a plurality of openings sufficient in size to allow liquids to pass through to the lower passageway, but sufficiently small in size to restrict any solid debris from entering into the lower passageway. No tools or fasteners are required for installation and no attachments are made to either the gutter itself or roof structure.