| Short Title: | Official Languages |
| Royal Assent: | 22 May 1925 |
| Date Effective: | 31 May 1910 |
| Summary: | Afrikaans is recognised to have been an official language since 31 May 1910 |
| Status: | repealed |
The Official Languages of the Union Act, 1925 (Dutch; Flemish: Wet op de Officiële Talen van de Unie, 1925 ), was an Act of the Parliament of South Africa that included Afrikaans as a variety of the Dutch language.
The Act commenced on 27 May 1925, but deemed to have had effect since the creation of the Union in 1910, having the effect of making Afrikaans an official language of the Union of South Africa since that date.
The South Africa Act of 1909—the constitution of the Union—declared the English and Dutch languages to be the state's official languages.
Part 8, section 137, of the South Africa Act read:
Doubts soon arose about the status of the Afrikaans language and whether its status as a Dutch daughter language implied it to be on equal footing.
The single substantive provision of the Official Languages Act reads:
The South Africa Act and the Official Languages Act were repealed by the Constitution of 1961, which reversed the position of Afrikaans and Dutch. Subsequently, English and Afrikaans were the official languages, and Afrikaans was deemed to include Dutch.
The Constitution of 1983 removed any mention of Dutch altogether.