| Author | Titles | | 1.
| Rowling, Nick | 1 | | 2.
| Roworth, Wendy Wassyng | 1 | | 3.
| Roxburgh, David J. | 1 | | 4.
| Roxo, Albertino Galvão | 1 | | 5.
| Roxo, Carlos de Sousa, 1935- | 14 | | 6.
| Roxo, Henrique de Brito Belford | 1 | | 7.
| Roxo, João | 2 | | 8.
| Roxo, Maria José | 1 | | 9.
| Roy, Alain | 1 | | 10.
| Roy, Alastair | 1 |
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