A Harlequin Romance Series – Books in Order by Author – O
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| No. | Author | Title | Year | Approx. $ |
| # 103 | O. M. Hall | Wanton City | 1951 | $10–30 |
| # 734 | Olga Gillman | Doctor Andrew, Guardian | 1963 | $6–18 |
| # 857 | Olga Gillman | Island Doctor (The Quiet Spot) | 1964 | $5–20 |
| # 243 | Oliver Anderson | School for Love | 1953 | $15–35 |
| # 94 | Oscar J. Friend | The Range Doctor | 1951 | $15–40 |
| # 77 | Owen Fox Jerome | A Night at Club Bagdad | 1950 | $20–50 |
| # 86 | Owen Fox Jerome | Double Life | 1950 | $20–50 |
Typical collector values are based on common paperback editions in Very Good condition. Exceptional condition, signed copies, or rare international editions may sell for more.