A surface mounting lamp includes a covering element of a transparent material and having a first face, which in use is directed outwards away from a mounting surface of the lamp, and a second face opposite the first face and provided with at least one socket for housing lighting elements. A lighting unit is sealably connected to the covering element, facing the inside of the socket and includes a plurality of lighting elements, each housed in the socket. The lamp also includes a junction piece connected to the covering element and having a connecting portion engageable with the mounting surface of the lamp to fix the position thereof, and a retaining mechanism interposed between the junction piece and the second face of the covering element and connecting the covering element to the junction piece.