Dafydd Ddu o Hiraddug (died 1371), also known as
Dafydd Ddu Athro o Hiraddug, was a
Welsh language poet,
grammarian, and cleric in the
diocese of Llanelwy (
St Asaph). He was once believed to be the son of a certain Hywel ap Madog of Tremeirchion, but this has now been disproven.