Múrna

Múrna may refer to the following:


 * Mourne (barony), a former barony in County Down, Northern Ireland, known as Múrna in Irish
 * The Múrna, spelt in Old Irish as Mughdorna, a people that gave their name to Mourne; see Mourne (barony)
 * Muirne, the mother of Fionn mac Cumhail in the Fenian Cycle of Irish mythology