| Country: | South Africa |
| Flag Year: | 1928 |
| Type: | presidential |
| Previous Election: | 1968 South African presidential election |
| Previous Year: | 1968 |
| Next Election: | 1978 South African presidential election |
| Next Year: | 1978 |
| Election Date: | February 21, 1975 |
| Nominee1: | Nicolaas Johannes Diederichs |
| Party1: | National Party (South Africa) |
| Electoral Vote1: | Unanimous |
| Percentage1: | 100% |
| State President | |
| Posttitle: | Elected State President |
| Before Election: | J. J. Fouché |
| Before Party: | National Party |
| After Election: | Nicolaas Diederichs |
| After Party: | National Party |
| Needed Votes: | 113 |
| Votes For Election: | 225 votes in the Parliament of South Africa |
The 1975 South African presidential election resulted in the unanimous election of Nicolaas Johannes Diederichs of the National Party by Parliament to the position of State President on February 21, 1975.[1] Diedrichs was sworn in on April 19, 1975 during an official ceremony at the Groote Kerk (large church) of Cape Town.