The present invention relates to a wall cabinet for modular kitchens made up of a first bottom (1 ), an identical top (2), a back panel (4) and two identical lateral sides (3), in which at least one metal section (6, 7, 100) is interposed between the lower sides (3a), being provided with a lower longitudinal groove (6b, 60b) designed to receive and support underthecabinet accessories and/or a longitudinal groove (7b, 70b) designed to receive a LED light (8).