- (Irish mythology) An Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa.
- The River Ness, a short river in Scotland which flows from Loch Ness through Inverness to the Beauly Firth.
- A surname.
- ness (landform)