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Mulryan Ó Maoilriaghain
Parent house	Laigin[1]
Country	Munster, Ormond & Leinster
Founder	Righin mac Dubhghall[2]
Titles	Lord of Idrone[2] Lord of Owney
Cadet branches	Ó Bruadair

Ó Maoilriain (anglicised as Ryan, Mulryan, or Mulrain) is an Irish Gaelic clan based in what is today County Tipperary and County Limerick. The clan claims descent from Cathair Mór of the Laighin, but they first appear in the historical record in the 15th century in the kingdom of Thomond. John O'Donovan claims they are distinct from the Ryan clan which ruled Uí Dróna in what is today County Carlow.

This family claim descent from one Maoil Riagháin, who was named in honour of a Saint Riagháin.

It is first documented as a surname in the 15th century in east Thomond/north Ormond, where the Ó Maoilriains attacked and displaced the Ó hIfearnáin family. The territory they conquered became known as barony of Owney and Arra. Owney derived its name from one Uaithne Ó Maoilriain.

According to historian C. Thomas Cairney, the O'Mulryans were one of the chiefly families of the Feara Cualann who in turn were a tribe from the Dumnonii or Laigin who were the third wave of Celts to settle in Ireland during the first century BC.^[5]

• Éamonn an Chnoic
• MacGorman — another Laighin clan of Thomond
• Irish clans

• The family of O'Mulryan in Spain, W.D. O'Ryan, The Irish Genealogist, 1961.
• Records of Four Tipperary Septs: the O'Kennedys, O'Dwyers, O'Mulryans, and O'Meaghers, M. Callaghan, JAG Publishing, Galway, 1972.
• Ryan:O´ Maolilriain, Dáithí Ó hÓgáin, Gill & Macmillan, Dublin, 2003.
• Laffan, Thomas (1911). Tipperary Families : Being The Hearth Money Records for 1665-1667. James Duffy & Co.

• Ryan at Araltas
• The O'Ryans of Owney by Donal F. Begley
• Clan Ryan Australia
• Clan Ryan at Tipperary Multeen Tourism
• Cromwellian Confiscations at Ireland Genealogy Project
• Ó Maoilriaghain at Library Ireland
• Ryan at The Irish Times
• The Origins of the Surname Ryan at The Tipperary Antiquarian
• Uí Dróna Kingdom at Medieval News

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