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1. O. Stephens, William
2. O'Brien, Sean
3. O'Byrne, Nicola
4. O'Byrne, Nicola
5. O'Connell, Joanne
6. O'Connor, Bridget
7. O'Connor, Elizabeth
8. O’Connor, Katherine Tiernan
9. O'Dowd, Chris
10. O'Hara, Lauren
11. O'Hara, Mo
12. O'Hara, Natalia
13. O'Hare, Gráinne
14. O'Kane, Owen
15. O'Neill, Amanda
16. O'Neill, Heather Aimee
17. O'Neill, Lisa
18. O'Neill, Lisa
19. O'Neill, Martin
20. O’Neill, Eamonn
21. O'Reilly, Bill
22. O'Sullivan, Ronnie
23. O'Yeah, Zac
24. O'Yeah , Zac
25. Oakley, Stu
26. Oborne, Martine
27. Odo
28. Ogden, Emily
29. Ogilvie, Sara
30. Ojari, Daniel
31. Olav Lahlum, Hans
32. Oliver, Abi
33. Olivotti, Sergio
34. Olley, Darcie
35. Olney, Peter
36. Olson, Parmy
37. Olusoga, David
38. Olusoga, Kemi
39. Olusoga, Yinka
40. Ondaatje, Michael
41. Orczy, Baroness
42. Ord, Charlotte
43. Orlando, Jade
44. Orwell, George
45. Orwell, George
46. Osho
47. Osmond, Richard
48. Ostaseski, Frank
49. Ounsley, Jodie
50. Owen, Amanda
51. Owen, Sid
52. Owens, Lisa
53. Oxlade, Chris
54. Oyemakinde, Tomi
55. Oyeyemi, Helen