Brian Ó Flaithbheartaigh
Brian Ó Flaithbheartaigh (died 1377) was an Irish chieftain of the O'Flaherty family who may have held the lordship, or taoiseach, of Iar Connacht, the Gaelic territory west of Lough Corrib in County Galway. His obituary in 1377 does not explicitly style him taoiseach.