The Good Service Medal, Gold, originally named the South African Defence Force Good Service Medal, Gold, is the senior of a set of three military medals which was instituted by the Republic of South Africa on 1 July 1975. It was initially awarded to members of all elements of the South African Defence Force for thirty years of exemplary service, but was restricted to Permanent Force personnel from 1993.

The Good Service Medal, Silver, originally named the South African Defence Force Good Service Medal, Silver, is the middle member of a set of three military medals which was instituted by the Republic of South Africa on 1 July 1975. It was initially awarded to members of all elements of the South African Defence Force for twenty years of exemplary service, but was restricted to Permanent Force personnel from 1993.