| Cairnbrook | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | USA Pennsylvania#USA |
| Pushpin Map Caption: | Location within the state of Pennsylvania |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Pennsylvania |
| Subdivision Type2: | County |
| Subdivision Name2: | Somerset |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 2.19 |
| Area Land Km2: | 2.19 |
| Area Water Km2: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 505 |
| Population Density Km2: | 230.96 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 2215 |
| Coordinates: | 40.1189°N -78.8181°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 15924 |
| Blank Name: | FIPS code |
| Blank Info: | 42-10720 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1170870 |
| Area Total Sq Mi: | 0.84 |
| Area Land Sq Mi: | 0.84 |
| Area Water Sq Mi: | 0.00 |
| Population Density Sq Mi: | 598.34 |
Cairnbrook is a census-designated place and coal town in Shade Township, Somerset County, Pennsylvania, United States. The community is located along Pennsylvania Route 160 within a mile of the borough of Central City. As of the 2010 census, the population was 520 residents.