Morgannwg

Morgannwg may refer to:
 * Glamorgan, a historic county in south Wales, called Morgannwg in Welsh
 * Kingdom of Morgannwg, a medieval kingdom in the same area
 * Morgannwg (journal), the journal of the Glamorgan History Society
 * Iolo Morganwg (1747–1826), a Welsh antiquarian and poet