| Official Name: | King Arthur Park, Montana |
| Settlement Type: | Census-designated place |
| Mapsize: | 250px |
| Pushpin Map: | Montana#USA |
| Pushpin Label: | King Arthur Park |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Montana |
| Subdivision Type2: | County |
| Subdivision Name2: | Gallatin |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.21 |
| Area Land Km2: | 1.20 |
| Area Water Km2: | 0.01 |
| Area Total Sq Mi: | 0.47 |
| Area Land Sq Mi: | 0.46 |
| Area Water Sq Mi: | 0.01 |
| Population As Of: | 2020 |
| Population Total: | 1549 |
| Population Density Km2: | 1292.74 |
| Population Density Sq Mi: | 3345.57 |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Elevation Ft: | 4843 |
| Coordinates: | 45.6681°N -111.1286°W |
| Area Code: | 406 |
| Blank Name: | FIPS code |
| Blank Info: | 30-40685 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2583820 |
King Arthur Park is a census-designated place (CDP) in Gallatin County, Montana, United States. The population was 738 at the 2010 census.[2]