| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Grafton Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | McHenry |
| Leader Title: | Supervisor |
| Established Title: | Established |
| Established Date: | November 6, 1849 |
| Area Total Sq Mi: | 36.13 |
| Area Land Sq Mi: | 35.79 |
| Area Water Sq Mi: | 0.34 |
| Area Water Percent: | 0.94 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 1484.8 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Website: | http://www.graftontownship.us |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 55053 |
| Blank Name: | FIPS code |
| Blank Info: | 17-111-30666 |
Grafton Township is located in McHenry County, Illinois. As of the 2010 census, its population was 53,137 and it contained 17,922 housing units.[2] Grafton Township includes portions of Huntley, Lake in the Hills, Algonquin, Crystal Lake, and Lakewood.
According to the 2010 census, the township has a total area of, of which (or 99.06%) is land and (or 0.94%) is water.[2]