Caumsett State Historic Park Preserve
| Caumsett State Historic Park Preserve | |
|---|---|
Winter Cottage at Caumsett State Historic Park Preserve | |
Location of Caumsett State Historic Park Preserve within New York State | |
| Type | State park |
| Location | 25 Lloyd Harbor Road Lloyd Harbor, New York |
| Coordinates | 40°55′39″N 73°28′18″W / 40.92750°N 73.47167°W |
| Area | 1,680 acres (6.8 km2) |
| Created | 1961 |
| Operated by | New York State Office of Parks, Recreation and Historic Preservation |
| Visitors | 980,410 (in 2024) |
| Open | All year |
| Website | Caumsett State Historic Park Preserve |
Marshall Field, III, Estate | |
Caumsett Hall in 2009 | |
| Coordinates | 40°55′39″N 73°28′18″W / 40.92750°N 73.47167°W |
| Built | 1925 |
| Architect | Pope, John Russell; Holden, McLaughlin & Associates |
| Architectural style | English Revival |
| NRHP reference No. | 79001633 |
| Added to NRHP | April 30, 1979 |
Caumsett State Historic Park Preserve is a state park on Lloyd Neck, a peninsula extending into the Long Island Sound, in the Village of Lloyd Harbor, New York, United States. It is operated by the New York State Office of Parks, Recreation and Historic Preservation.
The 1,680-acre (6.8 km2) park covers the former Marshall Field III estate, developed in the 1920s and was listed on the National Register of Historic Places in 1979. Most of the grounds of the former Seminary of the Immaculate Conception were acquired in 2026. Much of the park is managed as a nature preserve to protect high-quality bird habitats.