Abstract: A trotline guide comprising a substantially planar body having a recess in the upper edge including a circular portion and a slot for receiving and slidably accommodating a trotline together with a clamp on one side of the body for clamping the body to a hull of a fishing vessel so as to extend outwardly from the hull side wall perpendicular thereto in a substantially vertical plane with a spacing device on the one side of the body for engagement with the hull side wall to orient the body in the vertical plane.