South African Red Ensign
| South African Red Ensign | |
| Use | Civil ensign |
|---|---|
| Proportion | 1:2 |
| Adopted | 1910 |
| Relinquished | 1951 |
| Design | A Red Ensign with the coat of arms of South Africa on a white disc |
| South African Blue Ensign | |
| Use | State ensign and naval jack |
| Proportion | 1:2 |
| Adopted | 1910 |
| Relinquished | 1928 |
| Design | A Blue Ensign with the coat of arms of South Africa |
| Flag of the governor-general of South Africa | |
| Proportion | 1:2 |
| Adopted | 1910 |
| Relinquished | 1931 |
| Design | A Union Flag with the coat of arms of South Africa on a white disc in the center |
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The South African Red Ensign was the civil ensign of Union of South Africa from 1910 to 1951. From 1910 to 1928, the flag was also viewed as the unofficial flag of South Africa. The design of the flag was a red ensign defaced with the coat of arms of South Africa on a white disc.