| Official Name: | Monmouth, Indiana |
| Mapsize: | 120px |
| Pushpin Map: | USA Indiana Adams County |
| Pushpin Label: | Monmouth |
| Pushpin Map Caption: | Location in Adams County |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Adams |
| Subdivision Type3: | Township |
| Subdivision Name3: | Root |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 40.8678°N -84.9444°W |
| Elevation Ft: | 801 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46733 |
| Blank Name: | FIPS code |
| Blank Info: | 18-50130[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 439330 |
Monmouth is an unincorporated community in Root Township, Adams County, in the U.S. state of Indiana.
A post office was established at Monmouth in 1839, and remained in operation until it was discontinued in 1904.[2] The community was named after Monmouth County, New Jersey.[3]