Obama, Michelle
O’Brien, Anne
- THE ROYAL GAME (Pastons #1)
O’Connor, Clara
- SECRETS OF THE STAR CROSSED (The Once and Future Queen #1)
O’Farrell, Maggie
Oh, Axie
O’Hart, Sinéad
O’Keefe, Megan E.
- VELOCITY WEAPON (The Protectorate #1)
- CHAOS VECTOR (The Protectorate #2)
- CATALYST GATE (The Protectorate #3)
Okungbowa, Suyi Davies
- SON OF THE STORM (The Nameless Republic #1)
Okogwu, Tọlá
- ONYEKA AND THE ACADEMY OF THE SUN (Onyeka #1)
Onyebuchi, Tochi
- WAR GIRLS (War Girls #1)
Osman, Richard
- THE THURSDAY MURDER CLUB (The Thursday Murder Club #1)
- THE MAN WHO DIED TWICE (The Thursday Murder Club #2)
Overy, Alexandra
- THESE FEATHERED FLAMES (These Feathered Flames #1)
Owen, Margaret
- THE MERCIFUL CROW (The Merciful Crow #1)
- THE FAITHLESS HAWK (The Merciful Crow #2)
- LITTLE THIEVES (Little Thieves #1)
Owen, Morgan
- THE GIRL WITH NO SOUL (The Girl With No Soul #1)