| Official Name: | Marietta, Indiana |
| Settlement Type: | Unincorporated community and Census-designated place |
| Pushpin Map: | Indiana#USA |
| Pushpin Label: | Marietta |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Shelby |
| Subdivision Type3: | Township |
| Subdivision Name3: | Hendricks |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 39.4411°N -85.8769°W |
| Elevation Ft: | 725 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46176 |
| Blank Name: | FIPS code |
| Blank Info: | 18-46782[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2830533 |
Marietta is an unincorporated community in Hendricks Township, Shelby County, in the U.S. state of Indiana.
Marietta was platted in 1839.[2] A post office was established at Marietta in 1848, and remained in operation until it was discontinued in 1904.[3] Marietta once contained a high school which was discontinued at an unknown date.[4]