| Official Name: | San Marine, Oregon |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Oregon#USA |
| Pushpin Label: | San Marine |
| Coordinates: | 44.3536°N -124.0933°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Oregon |
| Subdivision Type2: | County |
| Subdivision Name2: | Lincoln |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 1.99 |
| Area Land Sq Mi: | 1.13 |
| Area Water Sq Mi: | 0.86 |
| Area Total Km2: | 5.15 |
| Area Land Km2: | 2.92 |
| Area Water Km2: | 2.23 |
| Population As Of: | 2020 |
| Population Density Km2: | 189.37 |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Elevation Ft: | 20 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 97498 (Yachats) |
| Area Code: | 541/458 |
| Blank Name: | FIPS code |
| Blank Info: | 41-65300 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2812890 |
| Population Total: | 553 |
| Unit Pref: | Imperial |
| Population Density Sq Mi: | 490.68 |
San Marine is an unincorporated community and census-designated place (CDP) in Lincoln County, Oregon, United States. It was first listed as a CDP prior to the 2020 census.
The CDP is in southern Lincoln County, along the Pacific Ocean. U.S. Route 101 passes through the CDP, leading north 5miles to Waldport and south 3miles to Yachats.