South Otter Township (T11N R7W) is located in Macoupin County, Illinois, United States.

As of the 2010 census, its population was 465 and it contained 204 housing units.

[2] According to the 2010 census, the township has a total area of 36.41 square miles (94.3 km2), of which 35.77 square miles (92.6 km2) (or 98.24%) is land and 0.63 square miles (1.6 km2) (or 1.73%) is water.

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