| Theta, Gauteng | |
| Pushpin Map: | South Africa Gauteng#South Africa |
| Coordinates: | -26.232°N 28.004°W |
| Subdivision Type: | Country |
| Subdivision Name: | South Africa |
| Subdivision Type1: | Province |
| Subdivision Name1: | Gauteng |
| Subdivision Type2: | District |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | City of Johannesburg |
| Subdivision Type4: | Main Place |
| Subdivision Name4: | Johannesburg |
| Established Title: | Established |
| Leader Title: | Councillor |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.58 |
| Population Total: | 0 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Demographics1 Title1: | Black African |
| Demographics1 Title2: | Coloured |
| Demographics1 Title3: | Indian/Asian |
| Demographics1 Title4: | White |
| Demographics1 Title5: | Other |
| Demographics2 Title5: | Other |
| Timezone1: | SAST |
| Utc Offset1: | +2 |
| Postal Code Type: | Postal code (street) |
| Postal2 Code Type: | PO box |
| Area Code Type: | Area code |
Theta is a suburb of Johannesburg, South Africa. It lies south-west of the Johannesburg CBD and is adjacent to Booysens Reserve. The suburb was originally developed for science, industrial and research businesses. It is located in Region F of the City of Johannesburg Metropolitan Municipality.
Prior to the discovery of gold on the Witwatersrand in 1886, the suburb lies on land on two of the original farms called Mooifontein and Vierfontein.[2] The suburb's name originates from the Greek letter Theta.[2]