Kragsyde (1883–85 – 1929) was a Shingle style mansion designed by the Boston architectural firm of Peabody & Stearns and built at Manchester-by-the-Sea, Massachusetts.

Kragsyde was commissioned by George Nixon Black Jr. (1842–1928), heir to a Boston real estate fortune, who had been a Harvard classmate of architect Robert Swain Peabody.

In 1882, Black paid $10,000 ($0.32 million today) for the 6 acre (2.4 ha) oceanfront plot on a peninsula called Smith's Point, overlooking Lobster Bay.

The house's most dramatic feature was a massive arch that formed a porte cochere and supported the loggia (open porch) and glass-enclosed billiard room above.

Guests arriving by carriage would be dropped off under the arch, enter through the front door, and climb an interior stair to the main floor, which featured formal rooms for entertaining.