| Official Name: | Big Rock Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Kane County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Kane County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Kane |
| Established Title: | Established |
| Area Total Sq Mi: | 35.11 |
| Area Land Sq Mi: | 35.11 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 52.9 |
| Elevation Footnotes: | [1] |
| Elevation M: | 216 |
| Elevation Ft: | 709 |
| Coordinates: | 41.7636°N -88.5467°W |
| Blank Name: | FIPS code |
| Blank Info: | 17-089-05989 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0428673 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [2] |
| Population Est: | 1887 |
| Unit Pref: | Imperial |
Big Rock Township is located in Kane County, Illinois. As of the 2010 census, its population was 1,859 and it contained 717 housing units.[3] Most of its land use is agricultural.
According to the 2010 census, the township has a total area of, all land.[3]
U.S. Route 30 runs east to west through the township.