| Lansdowne, New Jersey | |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA New Jersey Hunterdon County#USA New Jersey#USA |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location of Lansdowne in Hunterdon County Inset: Location of county within the state of New Jersey |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Hunterdon |
| Subdivision Type3: | Township |
| Subdivision Name3: | Franklin |
| Elevation Ft: | 167 |
| Coordinates: | 40.6083°N -74.9064°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 877671 |
| Unit Pref: | imperial |
Lansdowne (also spelled Landsdown or Lansdown) is an unincorporated community located within Franklin Township in Hunterdon County, New Jersey.[1] It was named after Lansdown, England.[2] Judge Samuel Johnston (1706–1785) owned a large estate here. Charles Stewart (1729–1800) married Mary Oakley Johnston (d. 1771), daughter of the judge, and lived in the mansion built here, Lansdown, which is listed on the National Register of Historic Places.[3] [4] [5]