| Official Name: | Alta, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA Illinois Peoria County |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Peoria |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 751 |
| Coordinates: | 40.8108°N -89.6342°W |
| Area Code: | 309 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 403461[1] |
Alta is an unincorporated community on the northwest border of Peoria in Peoria County, Illinois, United States. Alta is 8miles north-northwest of downtown Peoria. The decommissioned Illinois State Route 174 runs through Alta, and the Rock Island Trail begins in Alta.
Alta was laid out in 1873 when the railroad was extended to that point.[2] The community was so named on account of its lofty elevation. A post office was established at Alta in 1873, and remained in operation until the 1970s[3]