A luminaire, in particular a linear luminaire, comprising a luminaire base body which accommodates electrical components (14, 26) of the luminaire, wherein the luminaire base body comprises a connector, for example a plug, wherein the connector is movable between a retracted position and an extended position, wherein the connector projects from the luminaire base body in the extended position, wherein the luminaire comprises a handling element by which the connector is movable between the retracted position and the extended position, and the luminaire base body has a counter-piece, for example a socket, which is configured to establish an electrical plug-in connection with a further connector of a further luminaire arranged in an adjacent manner, said further connector corresponding to the aforementioned connector, wherein the handling element, after moving the connector into the extended position, projects over the luminaire base body such that the handling element is able to establish a mechanical connection between the luminaire and the adjacent luminaire, characterized in that the handling element comprises a retainer sleeve which is displaceably supported at an outer side of the luminaire base body along the longitudinal direction of the luminaire base body, with the retainer sleeve being attached running around the luminaire base body at the outer side of the luminaire base body and with a displacement of the retainer sleeve causing a movement of the connector, wherein the retainer sleeve is displaceable such that the retainer sleeve projects beyond the outer contour of the luminaire base body, wherein the handling element comprises sealing elements which establish a sealed connection between the luminaire base body and the handling element, on the one hand, and/or between the handling element and the adjacent luminaire, on the other hand, at least when the connector is in the extended position, wherein the retainer sleeve comprises two sealing rings, wherein, after the sealed connection has been established, one sealing ring contacts the luminaire and the second sealing ring contacts the adjacent luminaire. a luminaire base body which accommodates electrical components (14, 26) of the luminaire, wherein the luminaire base body comprises a connector, for example a plug, wherein the connector is movable between a retracted position and an extended position, wherein the connector projects from the luminaire base body in the extended position, wherein the luminaire comprises a handling element by which the connector is movable between the retracted position and the extended position, and the luminaire base body has a counter-piece, for example a socket, which is configured to establish an electrical plug-in connection with a further connector of a further luminaire arranged in an adjacent manner, said further connector corresponding to the aforementioned connector, wherein the handling element, after moving the connector into the extended position, projects over the luminaire base body such that the handling element is able to establish a mechanical connection between the luminaire and the adjacent luminaire, characterized in that the handling element comprises a retainer sleeve which is displaceably supported at an outer side of the luminaire base body along the longitudinal direction of the luminaire base body, with the retainer sleeve being attached running around the luminaire base body at the outer side of the luminaire base body and with a displacement of the retainer sleeve causing a movement of the connector, wherein the retainer sleeve is displaceable such that the retainer sleeve projects beyond the outer contour of the luminaire base body, wherein the handling element comprises sealing elements which establish a sealed connection between the luminaire base body and the handling element, on the one hand, and/or between the handling element and the adjacent luminaire, on the other hand, at least when the connector is in the extended position, wherein the retainer sleeve comprises two sealing rings, wherein, after the sealed connection has been established, one sealing ring contacts the luminaire and the second sealing ring contacts the adjacent luminaire.