| Official Name: | Lake Ellsworth Addition, Oklahoma |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Oklahoma#USA |
| Pushpin Label: | Lake Ellsworth Addition |
| Coordinates: | 34.8369°N -98.3214°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Oklahoma |
| Subdivision Type2: | County |
| Subdivision Name2: | Comanche |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 0.25 |
| Area Land Sq Mi: | 0.25 |
| Area Water Sq Mi: | 0.00 |
| Area Total Km2: | 0.65 |
| Area Land Km2: | 0.65 |
| Area Water Km2: | 0.00 |
| Population As Of: | 2020 |
| Population Density Km2: | 340.90 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1270 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 73006 (Apache) |
| Area Code: | 580 |
| Blank Name: | FIPS code |
| Blank Info: | 40-40875 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2812848 |
| Population Total: | 223 |
| Unit Pref: | Imperial |
| Population Density Sq Mi: | 881.42 |
Lake Ellsworth Addition is a census-designated place (CDP) in Comanche County, Oklahoma, United States. It was first listed as a CDP prior to the 2020 census.
The CDP is in northern Comanche County, to the northeast of Lake Ellsworth, an impoundment on East Cache Creek, a south-flowing tributary of the Red River. It sits just north of the lake's Tony Creek inlet. It is 6miles southeast of Apache, 5miles west-northwest of Fletcher, and 5miles north of Elgin.