The disclosure provides a luminaire and a luminaire combination. The luminaire combination includes at least two luminaires. The luminaire includes a housing and a light source module received in the housing. The housing defines a connecting groove therein. The connecting groove is in a flat strip shape and extends from an outer surface of the housing. One end of the connecting groove is opened for insertion of a connector. The connecting groove is provided with a limit portion on each of two opposite side walls thereof. A gap between each limit portion and a bottom surface of the connecting groove forms a channel guide. The connector is provided with a connecting portion on each of two opposite sides thereof. The connecting portion is operable to be inserted into and matched with the channel guide corresponding to the connection portion.