A ladder support for mounting on the facia board of a structure and securing the top end of a ladder to facilitate access to the roof of the structure. In a preferred embodiment the ladder support includes a pair of spaced legs extending outwardly and upwardly in spaced relationship from fixed attachment to the facia board and a crossbar connecting the extending legs intermediate the ends of the legs. The angle of extension of the legs facilitates clearance of any gutter which might also be mounted on the facia board of the structure and allows placement of the top segment of the ladder against the crossbar to support the ladder at a safe angle with respect to the supporting surface. In another preferred embodiment a sliding bracket is mounted on the crossbar and is fitted with a thumb screw for locking the bracket against one leg of the ladder and further securing the ladder on the crossbar.