| Official Name: | Prairie Township |
| Settlement Type: | Township |
| Image Map1: | Map of USA IN.svg |
| Map Caption1: | Location of Indiana in the United States |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Warren |
| Government Type: | Indiana township |
| Established Title: | Established |
| Established Date: | 1864 |
| Area Total Sq Mi: | 47.66 |
| Area Land Sq Mi: | 47.66 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2020 |
| Population Total: | 230 |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Footnotes: | [1] |
| Elevation M: | 222 |
| Elevation Ft: | 728 |
| Coordinates: | 40.4411°N -87.4564°W |
| Area Code: | 765 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 453772 |
Prairie Township is one of twelve townships in Warren County, Indiana, United States. According to the 2020 census, its population was 230 and it contained 110 housing units;[2] the population density is the lowest of any township in the county, at .[3]
Prairie Township was formed in 1864 out of a portion of Pine Township.[4]
According to the 2010 census, the township has a total area of, all land.[3] It is almost entirely agricultural and contains a single town, Tab. Two other small communities in the eastern part of the township, Locust Grove and Walnut Grove, dwindled away during the 20th century and are now extinct.
U.S. Route 41 runs along a portion of the township's eastern border, starting at the northeastern corner and going south for about before veering to the east.[5] Indiana State Road 26 runs from the Illinois state line and across the northern part of the township, reaching U.S. Route 41 at the eastern border.[6] Indiana State Road 352 leaves State Road 26 at the western border and runs north for about before leaving the township (and the county) on its way through the small town of Ambia in Benton County.[7] The township contains Dalton Airport.
Most of Prairie township lies in the Benton Community School Corporation, and the southern portion of Prairie Township is part of the Metropolitan School District of Warren County.[8]
Prairie Township has a trustee who administers rural fire protection and ambulance service, provides relief to the poor, manages cemetery care, and performs farm assessment, among other duties. The trustee is assisted in these duties by a three-member township board. The trustees and board members are elected to four-year terms.[9]
Prairie Township is part of Indiana's 8th congressional district, Indiana House of Representatives District 42,[10] and Indiana State Senate District 38.[11]