| Official Name: | Holcomb, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Ogle |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.23 |
| Area Land Km2: | 0.23 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.09 |
| Area Land Sq Mi: | 0.09 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 149 |
| Population Density Km2: | 648.09 |
| Population Density Sq Mi: | 1674.16 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 840 |
| Coordinates: | 42.0647°N -89.0956°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 61043 |
| Area Code: | 815 & 779 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 410374[2] |
Holcomb is an unincorporated community in Ogle County, Illinois, United States. Holcomb is 3miles south of Davis Junction. Holcomb has a post office with ZIP code 61043.[3] Holcomb was founded in 1876. It was named for William H. Holcomb (c. 1839–1908), General Manager of the Chicago and Iowa Railroad at the time. He was also the Superintendent of Transportation for the World's Columbian Exposition held in Chicago in 1893.