| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Mission Township |
| Image Map1: | Map of Illinois highlighting LaSalle County.svg |
| Mapsize1: | 150px |
| Map Caption1: | LaSalle County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | LaSalle |
| Leader Title: | Supervisor |
| Established Title: | Established |
| Established Date: | November 6, 1849 |
| Area Total Sq Mi: | 32.06 |
| Area Land Sq Mi: | 31.63 |
| Area Water Sq Mi: | 0.42 |
| Area Water Percent: | 1.31 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 125.6 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 4488 |
| Blank Name: | FIPS code |
| Blank Info: | 17-099-49646 |
Mission Township is located in LaSalle County, Illinois. As of the 2010 census, its population was 3,972 and it contained 1,083 housing units.[2]
Mission Township was given its name due to the church-riding ministers riding across to different churches in the township. One of these ministers, Jessie Walker, actually has a memorial at the United Methodist Church in Sheridan, which is the seat of the township.
The township is shares its western boundary with Serena Township, and its northern boundary with Northville Township. The township border is defined by where the Fox River goes southwest, turns south, then continues to go east, south, west, northwest, north, and then it then curves to go southwest again, forming an awkward "S" shape on the map.
The community of Sheridan resides at the beginning of the bends in the river, and the community of Norway resides where the river flows north, and then curves around to flow southwest. Millington resides along the river, northeast of Sheridan. The community of Newark resides along the county line within Kendall County, but the community is no more than 4 to 5 miles away from the river.
According to the 2010 census, the township has a total area of, of which (or 98.66%) is land and (or 1.31%) is water.[2]