Odhrán Mac Niallais (born 17 August 1992) is an Irish Gaelic footballer who plays for Gaoth Dobhair and the Donegal county team. With two Ulster Senior Football Championships to his name, Mac Niallais was a prominent feature of the Donegal midfield between 2014 and 2018. He is regarded nationally as "one of the most naturally gifted footballers in Ireland". He won an Ulster Senior Club Football Championship with Gaoth Dobhair in 2018.