| Official Name: | Alto Township |
| Settlement Type: | Township |
| Unit Pref: | Imperial |
| Image Map1: | Map of Illinois highlighting Lee County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Lee County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Lee |
| Leader Title: | Supervisor |
| Leader Name: | Dennis E. Burkhart |
| Established Title: | Established |
| Established Date: | February 28, 1860 |
| Area Total Sq Mi: | 34.94 |
| Area Land Sq Mi: | 34.9 |
| Area Water Sq Mi: | 0.04 |
| Area Water Percent: | 0.11 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 16.2 |
| Elevation M: | 253 |
| Elevation Ft: | 830 |
| Coordinates: | 41.8408°N -88.9975°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 60530, 60553, 61068 |
| Blank Name: | FIPS code |
| Blank Info: | 17-103-01101 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 534 |
Alto Township is one of twenty-two townships in Lee County, Illinois, USA. As of the 2010 census, its population was 565 and it contained 230 housing units.[2]
According to the 2010 census, the township has a total area of, of which (or 99.89%) is land and (or 0.11%) is water.[2]
The township contains these two cemeteries: Steward and Union.