| Official Name: | New Marshfield, Ohio |
| Settlement Type: | Census-designated place |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | County |
| Subdivision Name2: | Athens |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Population As Of: | 2020 |
| Population Total: | 316 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 843 |
| Coordinates: | 39.3253°N -82.2164°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 45766 |
| Area Code: | 740 |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2628942 |
New Marshfield is a census-designated place in central Waterloo Township, Athens County, Ohio, United States. The population was 316 at the 2020 census.[2] It has a post office with the ZIP code 45766.[3] It is located along State Route 56 west of the county seat of Athens.
The B&O Railroad formerly passed through the community, but the line was abandoned in the 1980s.
A post office called Marshfield was established in 1857, and the post office was renamed New Marshfield in 1909.[4] By the 1880s, (New) Marshfield had a train station and several stores.[5]
Public Education in the community of New Marshfield is provided by the Alexander Local School District. Campuses serving the community include Alexander Elementary School] (Grades PK-5), Alexander Middle School] (Grades 6–8), and Alexander High School (Grades 9–12).