| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | McHenry 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: | 48.03 |
| Area Land Sq Mi: | 44.74 |
| Area Water Sq Mi: | 3.3 |
| Area Water Percent: | 6.87 |
| Length Mi: | 6.07 |
| Width Mi: | 7.91 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 1065.2 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Website: | http://www.mchenrytownship.com/ |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 46719 |
| Blank Name: | FIPS code |
| Blank Info: | 17-111-45707 |
McHenry Township is located in McHenry County, Illinois. As of the 2010 census, its population was 47,653 and it contained 19,120 housing units.[2] McHenry Township shares the distinction with Nunda Township as being the two largest townships by land area in McHenry County, at 48.3sqmi each.
The township was named for William McHenry, an Illinois politician.[3]
According to the 2010 census, the township has a total area of, of which (or 93.15%) is land and (or 6.87%) is water.[2]