A single swimmer competed for South Africa at the 1912 Games. It was the nation's debut in swimming. Godfrey competed in one event, placing fifth in his quarterfinal of the 400 metre freestyle and not advancing to the semifinals.
Ranks given for each swimmer are within the heat.
Seven athletes represented South Africa. It was the nation's third appearance in both the sport and the Olympics. McArthur and Gitsham finished first and second, respectively, in the marathon to give South Africa its only athletics medals in 1912 as well as an Olympic record in the event with McArthur's mark. Richardson's Olympic record in the 10000 metres, set in the semifinals, was broken in the final; Richardson did not finish that race.
Ranks given are within that athlete's heat for running events.
A single cyclist represented South Africa. It was the second appearance of the nation in cycling. Rudolph Lewis won the gold medal, South Africa's first cycling medal.