Abstract: A cabinet mounting support device for supporting a cabinet at a selected height for mounting the cabinet. The cabinet mounting support device includes a base plate. A substantially hollow first tubular member is elongated and has a first end securely coupled to a top surface of the base plate such that the first tubular member is in a generally vertical orientation. The first tubular member has a plurality of pairs of opposed and aligned apertures therein extending between the first and second ends of the first tubular member. A second tubular member is elongated and has a first end and a second end. The second tubular member is substantially hollow. The first end is movably extendable into a second end of the first tubular member such that the second tubular member is telescopic with respect to the first tubular member. The second tubular member has a pair of opposed apertures therein positioned generally adjacent to the first end of the second tubular member.