| Official Name: | Thayer, Indiana |
| Settlement Type: | Unincorporated community and Census-designated place |
| Pushpin Map: | Indiana#USA |
| Pushpin Label: | Thayer |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Newton |
| Subdivision Type3: | Township |
| Subdivision Name3: | Lincoln |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 41.1739°N -87.3294°W |
| Elevation Ft: | 643 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46381 |
| Area Code: | 219 |
| Blank Name: | FIPS code |
| Blank Info: | 18-75518[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2830476 |
Thayer is an unincorporated community in Lincoln Township, Newton County, in the U.S. state of Indiana.
Thayer was laid out as a town in 1882.[2] The community was named for a first settler.[3] A post office has been in operation at Thayer since 1881.[4]
Thayer, along with Shelby, Sumava Resorts and other small Kankakee River communities, has historically had to contend with periodic flooding from the river.[5]