A reader line guide and line marking device consisting of an elongated rectangularly shaped flat plate like marker member having a top and bottom surface with a curved resilient L-shaped handle member extending longitudinally across the midsection of the marker member and having one end of the handle connected thereto with the base of the handle extending substantially parallel to the top of the marker member to define an elongated slot-like opening formed between the top surface of the marker member and the handle for snug insertion of a few of the fingers of one of a reader''s hands thereinto in a manner to guide the marker member from line-to-line of written matter as the bottom surface of the marker member rests on and glides along the top of the written matter to be read.