Domnall Ua Ruairc (died 1102) was King of Connacht. Not much is known of King Domnall but it is stated that he defeated and slew in battle the previous king Tadg Mac Ruaidrí Ua Conchobair.

• Leabhar na nGenealach, Dublin, 2004–2005
• Annals of the Four Masters, ed. John O'Donovan, Dublin, 1856
• Annals of Lough Ce, ed. W.M. Hennessey, London, 1871.
• Irish Kings and High Kings, Francis John Byrne, 3rd revised edition, Dublin: Four Courts Press, 2001. ISBN 978-1-85182-196-9
• "Ua Ruairc", in Seán Duffy (ed.), Medieval Ireland: An Encyclopedia. Routledge. 2005. pp.

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