| Official Name: | Dement Township |
| Settlement Type: | Township |
| Unit Pref: | Imperial |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Ogle |
| Established Title: | Established |
| Established Date: | September 11, 1855 |
| Area Total Sq Mi: | 35 |
| Area Land Sq Mi: | 34.95 |
| Area Water Sq Mi: | 0.05 |
| Area Water Percent: | 0.14 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 28.3 |
| Elevation M: | 262 |
| Elevation Ft: | 860 |
| Coordinates: | 41.9322°N -88.9969°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 60113, 61068 |
| Blank Name: | FIPS code |
| Blank Info: | 17-141-19382 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 957 |
Dement Township is one of twenty-four townships in Ogle County, Illinois, USA. As of the 2010 census, its population was 989 and it contained 409 housing units.[2]
Dement Township was formed from the east half of Flagg Township on September 11, 1855.[3] The township was named for John Dement (1804–1883), a politician and militia commander from Illinois.[4]
According to the 2010 census, the township has a total area of, of which (or 99.86%) is land and (or 0.14%) is water.[2] It contains the village of Creston, and the east side of the city of Rochelle.
The township contains Woodlawn Cemetery.