The Eday Group is a Devonian lithostratigraphic group (a sequence of rock strata) in Orkney, northern Scotland.

[1] The name is derived from the island of Eday where the strata are exposed in coastal cliffs.

[2] These rocks are exposed throughout Orkney, notably in coastal cliffs of Eday and western Sanday, South Ronaldsay and the Deerness peninsula of Mainland.

There are spectacular exposures of the Hoy Sandstone Formation and particularly the Trowie Glen Sandstone Member in the precipitous cliffs of Hoy's west coast.

The sediments vary from fluvial to lacustrine to lagoonal.