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1. O'Brian, Terrie
2. O'Brien, Gerry
3. O'Brien, Sean
4. O'Byrne, Nicola
5. O'Byrne, Nicola
6. O'Callaghan, Jonathan
7. O'Connell, Joanne
8. O'Connor, Bridget
9. O'Connor, Des
10. O'Connor, Elizabeth
11. O’Connor, Katherine Tiernan
12. O'Donnell, Bridget
13. O'Dowd, Chris
14. O'Furniture, Patty
15. O'Hagan, Andrew
16. O'Hara, Lauren
17. O'Hara, Mo
18. O'Hara, Natalia
19. O'Hare, Gráinne
20. O'Kane, Owen
21. O'Malley, Rory
22. O'Neill, Amanda
23. O'Neill, Eden
24. O'Neill, Heather Aimee
25. O'Neill, Lisa
26. O'Neill, Martin
27. O’Neill, Eamonn
28. O'Reilly, Bill
29. O'Rourke, P. J.
30. O'Shaughnessy, Patrick
31. O'Sullivan, Feargus
32. O'Sullivan, Heather
33. O'Sullivan, Ronnie
34. O'Sullivan, Suzanne
35. O'Toole, Peter
36. O'Yeah , Zac
37. Oakley, Phil
38. Oakley, Stu
39. Obama, Michelle
40. Obiora, Michael
41. Oborne, Martine
42. Ochlan, PJ
43. Ochman, Joe
44. Ochota, Mary-Ann
45. Odo
46. Ogden, Emily
47. Ogilvie, Sara
48. Ojari, Daniel
49. Ojo, Adenrele
50. Okello, Kate
51. Okoye, Nneka
52. Okuboyejo, Sandra
53. Olav Lahlum, Hans
54. Oldfield, Richard
55. Oldham, Andrew
56. Oldham, Gavin
57. Oliveira, Annette Amelia
58. Oliver, Abi
59. Oliver, Jana
60. Olivotti, Sergio
61. Olley, Darcie
62. Olney, Peter
63. Olson, Parmy
64. Olukoya, Dami
65. Olusoga, David
66. Olusoga, Kemi
67. Olusoga, Yinka
68. Onayemi, Prentice
69. Ondaatje, Michael
70. Ono, Yoko
71. Onwukwe, Ben
72. Orczy, Baroness
73. Ord, Charlotte
74. Orlando, Jade
75. Orsini, Kate
76. Ortega, Deanna
77. Ortega, Julio
78. Ortiz, Vico
79. Orwell, George
80. Osborne, George
81. Osbourne, Jack
82. Oseid, Kelsey
83. Osman, Jim
84. Osmond, Nicholas
85. Osmond, Richard
86. Osorio, Lee
87. Ostaseski, Frank
88. Ounsley, Jodie
89. Ovens, Sarah
90. Owen, Amanda
91. Owen, Sid
92. Owens, Lisa
93. Owusu, Jude
94. Oxlade, Chris
95. Oyemakinde, Tomi
96. Oyer, Paul
97. Oyeyemi, Helen
98. Ozaki, Yei Theodora