O’Brenan clan, [143]

O’Brien, William, Lord, [94]

O’Brien’s Bridge, [186]

O’Connolly, Owen, [16]

O’Dempsy clan, [28], [29]

O’Donnell, Neal, [161]

O’Donnells in Spain, [308]

Oglethorpe, Fanny, [308]

O’Hanlon, Redmond and Loughlin, [142], [143]

Oldbridge, [293]-[296]