Abstract: A guard for a trailer coupler having a lateral marginal flange defining a portion of the perimeter thereof. The guard includes a generally U-shaped member having a first longitudinal surface defining a contiguous inside perimeter of the U-shaped member. The first longitudinal surface has a channel formed therein extending the length of the inside perimeter of the U-shaped member. In use, the guard is placed in contact with the coupler with at least a portion of the lateral marginal flange received within the channel. The U-shaped member includes a first and a second leg extending laterally from a closed end of the U-shaped member. The first and second legs angle toward each other as they extend away from the closed end of the member so that the legs flex and releasably secure the U-shaped member when placed over the lateral marginal flange. The guard is preferably injection molded so that the preferred U-shape is preformed.