The Sanford Grammar School, also known as the Sanford High School and as the Margaret K. Reynolds Building, is a historic school building located at 301 West 7th Street in Sanford, Florida, United States. Built in 1902, it was designed by Wilbur B. Talley in the Romanesque Revival style of architecture. Sanford architect Elton James Moughton designed the wings which were added in 1916. On November 23, 1984, it was added to the U.S. National Register of Historic Places.