| Official Name: | Lake Eliza, Indiana |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Indiana#USA |
| Pushpin Label: | Lake Eliza |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Porter |
| Subdivision Type3: | Township |
| Subdivision Name3: | Porter |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 0.543 |
| Area Land Sq Mi: | 0.475 |
| Area Water Sq Mi: | 0.068 |
| Population As Of: | 2020 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 751 |
| Coordinates: | 41.4306°N -87.1811°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 46341 (Hebron) 46385 (Valparaiso) |
| Area Code: | 219 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 2830498 |
| Blank1 Name: | FIPS code |
| Blank1 Info: | 18-41112 |
Lake Eliza is an unincorporated community and census-designated place (CDP) in Porter County, Indiana, United States.
Lake Eliza is in western Porter County, surrounding the natural lake of the same name. It is 8miles north of Hebron, the same distance southwest of Valparaiso, the Porter county seat, and southeast of Gary.
According to the U.S. Census Bureau, the Lake Eliza CDP has an area of 0.54sqmi, of which 0.48sqmi are land and 0.07sqmi, or 12.52%, are water.[1] The lake outlet is at its south end, flowing into Wolf Creek, part of the Kankakee River watershed leading to the Illinois River.