- O'Brien, Ellen, author1
- O'Grady, Madeline, author2
- O'Masta, Brenna, author1
- O'Sullivan, Maryann, author1
- Okumura, Megumi , author1
- Okumura, Megumi, author1
- Omi, Joanna, author1
- Orgera, Kendal, author8
- Orlova, Natalia S., author1
- Ostrer, Isabel, author1