| Country: | South Africa |
| Flag Year: | 1912 |
| Type: | Parliamentary |
| Previous Election: | 1920 South African general election |
| Previous Year: | 1920 |
| Election Date: | 8 February 1921 |
| Next Election: | 1924 South African general election |
| Next Year: | 1924 |
| Seats For Election: | All 134 seats in the House of Assembly |
| Majority Seats: | 68 |
| Registered: | 499,531 |
| Turnout: | 55.60% (11.34pp) |
| Image1: | Genl JC Smuts (cropped).jpg |
| Leader1: | Jan Smuts |
| Party1: | South African Party |
| Last Election1: | 50.51%, 66 seats |
| Seats1: | 77 |
| Seat Change1: | 11 |
| Popular Vote1: | 137,389 |
| Percentage1: | 49.90% |
| Swing1: | 0.61pp |
| Leader2: | J. B. M. Hertzog |
| Party2: | National Party (South Africa) |
| Last Election2: | 32.62%, 43 seats |
| Seats2: | 44 |
| Seat Change2: | 1 |
| Popular Vote2: | 105,039 |
| Percentage2: | 38.15% |
| Swing2: | 5.53pp |
| Image3: | Kolonel Cresswell (cropped).jpg |
| Leader3: | Frederic Creswell |
| Party3: | Labour Party (South Africa) |
| Last Election3: | 14.65%, 21 seats |
| Seats3: | 10 |
| Seat Change3: | 11 |
| Popular Vote3: | 29,406 |
| Percentage3: | 10.68% |
| Swing3: | 3.97pp |
| Prime Minister | |
| Before Election: | Jan Smuts |
| Before Party: | South African Party |
| After Election: | Jan Smuts |
| After Party: | South African Party |
General elections were held in South Africa on 8 February 1921 to elect the 134 members of the House of Assembly.[1] The South African Party, which since the previous election had fused with the Unionist Party, won an absolute majority.
The South Africa Act 1909 had provided for a delimitation commission to define the boundaries for each electoral division. The representation by province, under the third delimitation report of 1919, is set out in the table below. The figures in brackets are the number of electoral divisions in the previous (1913) delimitation. If there is no figure in brackets then the number was unchanged.[2]
The electoral divisions used for this general election were the same as those for the 1920 election.