A peep sight which enables viewing above and below an intended target includes a body which develops a frame for defining a shaped aperture and a peripheral groove for receiving a bowstring, for mounting the peep sight to the bowstring. The shaped aperture forms a single, vertically elongated sight window which provides a large sight picture to facilitate viewing of the target, especially in low light situations, and which is free of internal structures. In use, the peep sight allows an archer to immediately focus on the sighting pins of the bow, and then on the target, without obstruction.