Block Island Southeast Light
| The Block Island Southeast Light in May, 2015 | |
| Location | South East Light Road, New Shoreham, Rhode Island | 
|---|---|
| Coordinates | 41°9′12.3″N 71°33′7.7″W / 41.153417°N 71.552139°W | 
| Tower | |
| Constructed | 1875 | 
| Foundation | Granite / Concrete / Brick | 
| Construction | Red brick | 
| Automated | 1990 | 
| Height | 52 feet (16 m) | 
| Shape | Octagonal pyramidal tower attached to dwelling | 
| Markings | Natural with black lantern | 
| Heritage | National Historic Landmark, National Register of Historic Places listed place, America's Most Endangered Places | 
| Fog signal | Horn, 1 every 30 sec | 
| Light | |
| First lit | 1875 | 
| Deactivated | 1990-1994 | 
| Focal height | 261 feet (80 m) | 
| Lens | 1st order Fresnel lens | 
| Range | 20 nautical miles (37 km; 23 mi) | 
| Characteristic | Fl Green 5 sec | 
| Block Island South East Light | |
| Architect | US Light House Board; Tynan, T.H. | 
| Architectural style | Gothic | 
| NRHP reference No. | 90001131 (NRHP) 97001264 (NHL) | 
| Significant dates | |
| Added to NRHP | August 6, 1990 | 
| Designated NHL | September 24, 1997 | 
Block Island Southeast Light is a lighthouse located on Mohegan Bluffs at the southeastern corner of Block Island, Rhode Island. It was designated a U.S. National Historic Landmark in 1997 as one of the most architecturally sophisticated lighthouses built in the United States in the 19th century.