Bran Becc mac Murchada (died 738) was a King of Leinster from the Uí Dúnlainge branch of the Laigin.
He was the son of Murchad mac Brain Mut (died 727), a previous king.
The Annals of Tigernach claim that in 738 Cathal mac Finguine (died 742), king of Munster led a hosting into Leinster and took hostages and treasure from Bran.
[2] However, the Annals of Ulster claim that it was his brother Fáelán mac Murchada (died 738) who gave the hostages which is more likely.
The Annals of Ulster say:[5]And men say that so many fell in this great battle that we find no comparable slaughter in a single onslaught and fierce conflict throughout all preceding ages.