| Official Name: | Dunleith Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Jo Daviess County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Jo Daviess County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Jo Daviess |
| Leader Title: | Supervisor |
| Leader Name: | Vincent Hasken |
| Established Title: | Established |
| Established Date: | March 2, 1865 |
| Area Total Sq Mi: | 11.75 |
| Area Land Sq Mi: | 9.45 |
| Area Water Sq Mi: | 2.29 |
| Area Water Percent: | 19.49 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 404.2 |
| Elevation M: | 223 |
| Elevation Ft: | 732 |
| Coordinates: | 42.4783°N -90.6133°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 61025 |
| Blank Name: | FIPS code |
| Blank Info: | 17-085-21202 |
| Pop Est As Of: | 2016 |
| Population Est: | 3672 |
| Unit Pref: | Imperial |
Dunleith Township is one of 23 townships in Jo Daviess County, Illinois, United States. As of the 2010 census, its population was 3,820 and it contained 1,713 housing units.[1] It was formed from Menominee Township on March 2, 1865.
Dunleith Township is in the very northwest corner of Illinois, abutting Wisconsin to the north and Iowa to the west across the Mississippi River.
According to the 2010 census, the township has a total area of, of which (or 80.43%) is land and (or 19.49%) is water.[1]
Dunleith is Townships 28 (part) and 29 North, Range 2 (part) West of the Fourth Principal Meridian.