| Coordinates: | 58.3°N -6.87°W |
| Location Map: | Scotland Outer Hebrides |
| Caption: | Cealasaigh shown within the Outer Hebrides |
| Gridreference: | NB146418 |
| Celtic Name: | Cealasaigh |
| Norse Name: | Unknown |
| Area: | <10 ha |
| Highest Elevation: | 25m (82feet) |
| Island Group: | Outer Hebrides |
| Local Authority: | Comhairle nan Eilean Siar |
Cealasaigh or Kealasay is an islet in outer Loch Ròg, Lewis, Scotland that lies north of Traigh Mhór on Little Bernera and south of Campaigh.
To the west is the islet of Eilean Fir Chrothair (isle of the shepherd) and Sgeir na h-Aon Chaorach (lone sheep rock) lies to the east.[1]