| Date: | 10 June 1909 |
| Country: | Colony of Natal |
| Yes: | 11,121 |
| No: | 3,701 |
| Invalid: | 0 |
| Electorate: | 25,463 |
A referendum on joining the Union of South Africa was held in the Colony of Natal on 10 June 1909.[1] It was approved by 75% of voters, and Natal became part of the Union when it was established on 31 May 1910.
| Choice | Votes | % |
|---|---|---|
| For | 11,121 | 75.03 |
| Against | 3,701 | 24.97 |
| Invalid/blank votes | – | |
| Total | 100 | |
| Registered voters/turnout | 25,463 | |
| align=left colspan=3 | Source: African Elections Database |