| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Senachwine Township |
| Image Map1: | Map of Illinois highlighting Putnam County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Putnam County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Putnam |
| Leader Title: | Supervisor |
| Established Title: | Established |
| Established Date: | November 8, 1855 |
| Area Total Sq Mi: | 40.07 |
| Area Land Sq Mi: | 31.86 |
| Area Water Sq Mi: | 8.21 |
| Area Water Percent: | 20.49 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 23.4 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 712 |
| Blank Name: | FIPS code |
| Blank Info: | 17-155-68627 |
Senachwine Township is located in Putnam County, Illinois. As of the 2010 census, its population was 745 and it contained 651 housing units.[2]
According to the 2010 census, the township has a total area of, of which (or 79.51%) is land and (or 20.49%) is water.[2]