This page details the South African Army order of battle in 1940, before and after the formation of expeditionary forces.

Defence Headquarters: Pretoria, Transvaal[2] HQ The Castle, Cape Town, Cape Province HQ East London, Cape Province HQ Durban, Natal HQ Bloemfontein, Orange Free State HQ Robert's Heights, Transvaal HQ Johannesburg, Transvaal 11 Field Postal Unit