Agents persons, peoples and institutions
O'Hussey (Eochaidh) See: Eochaidh Ó hEodhasa
O'Kane (John) See: Seán Ó Catháin [scribe]
- fl. 19th century
- d. 1937
- d. 1954
- 1828–1906
- County Down
- s. xx–xxi
- d. 1901
O'Looney (Bryan) See: Brian O'Looney
- s. xx–xxi
O'Luinin (Rory) See: Ruaidhrí Ó Luinín
- d. 1903
- d. 1903
- d. 2003
O'Molloy (Hugh) See: Aodh Ó Maolmhuaidh
O'Mulloy (Hugh) See: Aodh Ó Maolmhuaidh
- d. 1953
- s. xx–xxi
- s. xx–xxi
O'Neill (Turlough Luineach) See: Toirdhealbhach Luineach Ó Néill
- d. 1913