Sutton Castle or Sutton House is a Victorian Tudor-style castellated mansion house with terraced gardens on the southern coast of Howth Head, overlooking Dublin Bay, in the suburbs of Dublin, Ireland.

It has a Gothic porch, terracotta tiling, and art deco-style chimneys, and the original bay and window structure is retained.

The main stairway was retained and restored, and a lift was added prior to the sale as apartments.

[16][2] The house was damaged by fire in 1925 while newlywed Jameson and Ruth Hart were on honeymoon in New York but was later restored to its original condition.

[18] A nearby Martello Tower, right on the coast, in the area known as Red Rock, and constructed in 1804, is also listed on the Record of Protected Structures for Fingal (RPS 0579).