| Lansdown | |
| Coordinates: | 40.6061°N -74.9067°W |
| Map Label: | Lansdown |
| Architecture: | Greek Revival, Georgian |
| Added: | November 2, 1979 |
| Refnum: | 79001497 |
| Designated Other1 Name: | New Jersey Register of Historic Places |
| Designated Other1 Abbr: | NJRHP |
| Designated Other1 Link: | New Jersey Register of Historic Places |
| Designated Other1 Date: | July 21, 1979 |
| Designated Other1 Number: | 1588[1] |
| Designated Other1 Num Position: | bottom |
| Designated Other1 Color: |
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Lansdown, also known as the Charles Stewart Plantation, is a historic house located on Hamden Road along the South Branch Raritan River in the village of Lansdowne, northeast of Pittstown, in Franklin Township, Hunterdon County, New Jersey. It was added to the National Register of Historic Places on November 2, 1979, for its significance in architecture, military, and politics/government.[2]
The oldest part of the house was probably built, when the land was deeded to Charles Stewart by his father-in-law, Justice Samuel Johnston.[2] George Washington and his wife often visited this house.[3]