- Not Dead Yet by Jenn Burke
- Not What It Seems by Nicky James
- Nothing but Good by Kess McKinley
- Nowhere Man: Another John Pickett Novella by Sheri Cobb South
- Nowhere Ranch by Heidi Cullinan
- Object of Desire by Dal Maclean
- Of One Heart by Cynthia Wright
- Off Balance by Jay Hogan
- Off Limits by Riley Hart
- Off Plan by May Archer
- On Board by Jay Hogan
- On the Wings of War by Hailey Turner
- Once Upon a Haunted Moor by Harper Fox
- Once Upon a Marquess by Courtney Milan
- Once Upon a Tartan by Grace Burrowes
- Once Upon a Tower by Eloisa James
- One Dark Wish by Sharon Wray
- One Night in Hartswood by Emma Denny
- One Perfect Rose by Mary Jo Putney
- One Time Only by Lauren Blakely
- One Year Home by Marie Force
- Only a Kiss by Mary Balogh
- Only a Promise by Mary Balogh
- Only Beloved by Mary Balogh
- Open Secret by Fiona Quinn