Baldoyle Bay is a sea inlet on the east coast of Fingal in Ireland, in the traditional County Dublin.

It is bounded on the seaward side by the peninsula on which the Velvet Strand (used as a runway for early flights) and the Portmarnock Golf Club course are situated.

[5] Baldoyle Bay is an important coastal site, used by wintering wildfowl, including Brent geese, and waders and other birds.

Regularly sighted species included mallard duck, shelduck, great crested grebe, pintail, golden plover, redshank, bartailed godwit and the common scoter.

Declared a Statutory Nature Reserve in 1988[7] the inner, estuarine, parts of the bay are protected as a Special Area of Conservation (SAC)[8] while, under the Ramsar Convention, the wetlands have been designated as of international importance.

The Baldoyle area was raided and later settled by the "dark-haired foreigners" (Danish Vikings), who found the bay convenient for their long-boats, with their shallow draft - the Mayne River and related streams provided fresh water.