List of Famous people named Niall

Niall Frossach (718–778) was an 8th-century Irish king of Ailech, sometimes considered to have been High King of Ireland. Brother of high king Áed Allán, Niall was the son of high king Fergal mac Máele Dúin and a member of the Cenél nEógain, a branch of the Northern Uí Néill. The epithet Frossach (showery) is said to come from showers of silver, honey and wheat which fell on his home at Fahan in Inishowen at his birth.

Niall Williams is a New Zealand rugby sevens player and former New Zealand international touch football captain. She is a member of New Zealand's women's national rugby sevens team and was selected for their squad to the 2016 Summer Olympics, where New Zealand claimed the silver medal behind Australia. In touch football she won gold at the 2005 Youth World Cup and silver at the 2011 Touch Football World Cup.

Niall mac Cernaig Sotal was a king in southern Brega of the Uí Chernaig sept of Lagore of the Síl nÁedo Sláine. He was the grandson of the high king Diarmait mac Áedo Sláine. His father Cernach Sotal had died during plague years in 664.

Niall Garve O'Donnell was an Irish chieftain, alternately an ally of and rebel against English rule in Ireland. He is best known for siding with the English against his kinsman Hugh Roe O'Donnell during the Nine Years' War in the 1590s.

Patrick Niall MacGinnis was an Irish actor who made around 80 screen appearances.