Damnonia

Damnonia may refer to:


 * Damnonia, land of the Damnonii, a Celtic tribe of Roman Britain in what today is southern Scotland
 * Damnonia, a name of the Kingdom of Strathclyde, the early mediaeval kingdom that subsumed the Damnonii
 * Damnonia, an alternative spelling of Dumnonia, the early mediaeval kingdom (named for the Celtic tribe of Roman Britain, the Dumnonii), in what today is Devon and Cornwall.