| Official Name: | Lynn Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Henry County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Henry County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Henry |
| Established Title: | Established |
| Established Date: | November 4, 1856 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 36.36 |
| Area Land Sq Mi: | 36.32 |
| Area Water Sq Mi: | 0.04 |
| Area Water Percent: | 0.11 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 20.5 |
| Elevation M: | 207 |
| Elevation Ft: | 679 |
| Coordinates: | 41.2767°N -90.3717°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 61262, 61273, 61413, 61468 |
| Blank Name: | FIPS code |
| Blank Info: | 17-073-45304 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 729 |
Lynn Township is one of twenty-four townships in Henry County, Illinois, USA. As of the 2010 census, its population was 745 and it contained 311 housing units.[2] Lynn changed its name originally from Linn Grove Township to Lynnville Township on April 13, 1857, and then again from Lynnville to Lynn on an unknown date.
According to the 2010 census, the township has a total area of, of which (or 99.89%) is land and (or 0.11%) is water.[2]
(This list is based on USGS data and may include former settlements.)
The township contains these two cemeteries: Lynn Center and Swedona.