Old Nassau County Courthouse | |
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 Interactive map showing the location of Old Nassau County Courthouse | |
| Location | 1550 Franklin Ave., Garden City, New York |
|---|---|
| Coordinates | 40°44′16″N 73°38′24″W / 40.73778°N 73.64000°W |
| Area | 5 acres (2.0 ha) |
| Built | 1900-1901 |
| Architect | William B. Tubby |
| Architectural style | Classical Revival |
| NRHP reference No. | 78001863[1] |
| Added to NRHP | February 17, 1978 |
The Old Nassau County Courthouse, also known as the Nassau County Courthouse and the Historic Nassau County Courthouse, is an historic two-story courthouse building located at 1550 Franklin Avenue in Garden City, in Nassau County, on Long Island, in New York, United States.