Sanday may refer to:
- Sanday, Inner Hebrides () in the Small Isles
- Sanday, Orkney
- Sanday Airport
- Sanday Light Railway
- Sanday (surname)
See also
- Sanda Island () off Kintyre
- Sandray () in the Outer Hebrides
- Handa Island () off Sutherland
- Sandoy, Faroe Islands
- Sandøy Municipality, Norway