Shielmartin Hill or Shelmartin[1][2] (163 metres (535 ft) high) is a peak on Howth Head in County Dublin, Ireland.

From it can be seen Portmarnock, Sutton, Bull Island and the coastal areas behind it, and most of Dublin Bay.

From Sutton Creek, the crest of the hill seems to be cleft in two, but the actual peak is the southern one (i.e. the one to the right in the picture) - the northern one is an ancient cairn, on whose southern edge three or four modern cairns in the form of circles have been built.

[3][4][5] A sign engraved on a stone slab indicates that the only right of way lies down the northwest side of the hill.

Also adjacent is Dun Hill, while nearby are Muck Rock (Carrickmore) and Carrickbrack.