| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Alden Township |
| Image Map1: | Map of Illinois highlighting McHenry County.svg |
| Mapsize1: | 150px |
| Map Caption1: | McHenry County's location in Illinois |
| Coordinates: | 42.4481°N -88.5308°W |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | McHenry |
| Leader Title: | Supervisor |
| Established Title: | Established |
| Established Date: | November 6, 1849 |
| Area Total Sq Mi: | 33.46 |
| Area Land Sq Mi: | 33.41 |
| Area Water Sq Mi: | 0.05 |
| Area Water Percent: | 0.15 |
| Population As Of: | 2020 |
| Population Total: | 1275 |
| Population Density Sq Mi: | 42 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Website: | http://alden-township.org/ |
| Blank Name: | FIPS code |
| Blank Info: | 17-111-00607 |
Alden Township is located in McHenry County, Illinois. As of the 2020 census, its population was 1,275 and it contained 620 housing units.
According to the 2010 census, the township has a total area of, of which (or 99.85%) is land and (or 0.15%) is water.[1]