House at 251 Rocklyn Avenue
 House at 251 Rocklyn Avenue is a historic home located at Lynbrook in Nassau County New York. It is an L-shaped dwelling with 2-story central section a 2-story addition to the east and 1 1⁄2-story addition to the west with a 1-story rear addition and cross gable roof. The oldest section the west section was built about 1793. A single-story partially enclosed porch extends across the center section.It was listed on the National Register of Historic Places in 2008.