The South African Defence Force (SADF) comprised the armed forces of South Africa from 1957 until 1994. Shortly before the state reconstituted itself as a republic in 1961, the former Union Defence Force was officially succeeded by the SADF, which was established by the Defence Act of 1957. The SADF, in turn, was superseded by the South African National Defence Force in 1994.

The Union Defence Force (UDF) comprised the armed forces of South Africa from 1 July 1912, when the Defence Act took effect, two years after the creation of the Union of South Africa, until 1957 when it was reorganised and renamed the South African Defence Force.