| Official Name: | South Fork Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Audrain |
| Area Total Km2: | 120.03 |
| Area Land Km2: | 117.78 |
| Area Water Km2: | 2.25 |
| Area Water Percent: | 1.87 |
| Population As Of: | 2010 |
| Population Total: | 5431 |
| Population Density Km2: | 46.1 |
| Elevation Footnotes: | [1] |
| Elevation M: | 229 |
| Elevation Ft: | 751 |
| Coordinates: | 39.1697°N -91.8611°W |
| Blank Name: | FIPS code |
| Blank Info: | 29-68744[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0766247 |
South Fork Township is one of eight townships in Audrain County, Missouri, United States. As of the 2010 census, its population was 5,431.[3] In reference to the 2020 decennial census, the population of the Township was 5,383[4] with the median age being 39.5.[5]
South Fork Township covers an area of 120km2 and contains one incorporated settlement, Vandiver. It contains three cemeteries: East Lawn Memorial, Lockridge and New Hope.
Blackmore Lake, Teal Lake and Timber Lake are within this township. The streams of Beaverdam Creek, Davis Creek, Elm Branch, Long Branch, Scattering Fork and Youngs Creek run through this township.
South Fork Township contains one airport or landing strip, Mexico Memorial Airport.