Wilcox Township was a township in Hancock County, Illinois, USA. As of the 2010 census, its population was 189 and it contained 82 housing units. It was formed from the rural portion of Warsaw Township on November 15, 1855, when that township became co-extensive with the city of Warsaw. In November 2016, the township voted to merge with Rocky Run Township due to low population. It is now part of Rocky Run-Wilcox Township.
According to the 2010 census, the township has a total area of , of which (or 95.63%) is land and (or 4.37%) is water.
The township contains Green Plains Cemetery.