| Official Name: | Plain Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Kosciusko |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 35.9 |
| Area Land Sq Mi: | 33.93 |
| Area Water Sq Mi: | 1.97 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 8819 |
| Population Density Sq Mi: | 226.9 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Footnotes: | [2] |
| Elevation M: | 256 |
| Elevation Ft: | 840 |
| Coordinates: | 41.2997°N -85.8272°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-60228[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453743 |
Plain Township is one of seventeen townships in Kosciusko County, Indiana, United States. As of the 2020 census, its population was 8,819 (up from 7,698 at 2010[4]) and it contained 4,129 housing units.
The Robert Orr Polygonal Barn was listed on the National Register of Historic Places in 1992.
According to the 2010 census, the township has a total area of, of which (or 94.51%) is land and (or 5.49%) is water.[4]
(This list is based on USGS data and may include former settlements.)