| Official Name: | Keystone, Indiana |
| Settlement Type: | Unincorporated community and Census-designated place |
| Mapsize: | 150px |
| Pushpin Map: | USA Indiana Wells County |
| Pushpin Label: | Keystone |
| Pushpin Map Caption: | Location of Keystone in Wells County |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Wells |
| Subdivision Type3: | Township |
| Subdivision Name3: | Chester |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 40.5936°N -85.2603°W |
| Elevation Ft: | 866 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46759 |
| Blank Name: | FIPS code |
| Blank Info: | 18-39654[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2830580 |
Keystone is an unincorporated community in Chester Township, Wells County, in the U.S. state of Indiana.
A large share of the early settlers being natives of Pennsylvania caused the name of Keystone to be selected, after the Keystone State.[2]
The post office at Keystone has been in operation since 1871.