The Wicklow Reef (Irish: Sceir Cill Mhantáin) is a shallow subtidal reef in the Irish Sea, located off the coast of County Wicklow, Ireland, approximately 2.88 kilometres (1.79 mi) northeast of Wicklow Head.

The reefs are constructed by the honeycomb worm (Sabellaria alveolata) and are located at a depth of 12 to 30 metres (39 to 98 ft).

Sub-tidal reefs are exceptionally rare in the region, being typically found in the Mediterranean.

[2] The reef is home to a number of species of crab, starfish, sea-squirts, brittlestars, as well as molluscs and bryozoans.

Several species of worm such as Phaeostachys spinifera, Eulalia ornata and Unciola crenatipalma are very uncommon in Irish waters, and the Wicklow Reef is therefore considered a priority habitat.