By Surname:
Important note: inclusion on this index does not imply anything about the sexual orientation of the person - they may have expressed an opinion on homosexuals or lesbians, have written a book on the subject, or someone else may have mentioned them in a newspaper cutting.
- Edna O’ Brien
- Sean O’Brien
- Tom O’ Carroll
- Des O’Connor
- Sinead O’Connor
- Josie O’Dywer
- Gilbert O’ Sullivan
- Melvin Oakes
- Phillip Oakes
- Ann Oakley
- Mark Oaten
- Doris Odlum
- Derek Ogg
- Paul O’Grady
- Scott O’Hara
- Georgia O’Keeffe
- Maurice Oldfield
- Renate Olins
- Laurence Oliphant
- Laurence Olivier
- Marc Oraison
- D. Oriel
- Richard Olland
- Aristotle Onassis
- Christina Onassis
- Jacqueline Onassis
- Joe Orton
- George Orwell
- Cyril Osbourne
- John Osborne
- Ozzy Osborne
- Herman Ousley
- Peter Owen
- Wilfred Owen
- Ken Oxford
- Charles Oxley
- Nigel Owens
- Paddy O' Connell
- Bob Osborne