Lucius O'Brien

Lucius O'Brien may refer to:

• Lucius O'Brien (died 1717)
• Sir Lucius O'Brien, 3rd Baronet (1731–1795), Member of the Parliament of Ireland
• Lucius O'Brien, 13th Baron Inchiquin (1800–1872), Irish politician and nobleman
• Lucius O'Brien, 15th Baron Inchiquin (1864–1929)
• Lucius Richard O'Brien (1832–1899), Canadian painter
• Lucius O'Brien (priest) (1842–1913), Dean of Limerick in the Church of Ireland

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