The Gododdin (Welsh pronunciation: [ɡoˈdoðin]) were a P-Celtic speaking Brittonic people of north-eastern Britannia, the area known as the Hen Ogledd or Old North (modern south-east Scotland and north-east England), in the sub-Roman period. Descendants of the Votadini, they are best known as the subject of the 6th-century Welsh poem Y Gododdin, which memorialises the Battle of Catraeth and is attributed to Aneirin.
The name Gododdin is the Modern Welsh form, but the name appeared in Old Welsh as Guotodin and derived from the tribal name Votadini recorded in Classical sources, such as in Greek texts from the Roman period.
It is not known exactly how far the kingdom of the Gododdin extended, possibly from the Stirling area to the kingdom of Bryneich (Bernicia), and including what are now the Lothian and Borders regions of eastern Scotland. It was bounded to the west by the Brythonic Kingdom of Strathclyde, and to the north by the Picts. Those living around Clackmannanshire were known as the Manaw Gododdin. According to tradition, local kings of this period lived at both Traprain Law and Din Eidyn (Edinburgh, whose English name is ultimately a calque, with the Old English -burh corresponding to the Cumbric din; in Scottish Gaelic it is still known as Dùn Éideann), and probably also at Din Baer (Dunbar, Scottish Gaelic Dùn Bàrr).