Harlequin Superromance Series, by Author’s Last Name – O
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| # | Author | Book Title | Year |
| # 967 | O’Brien, Kathleen | A Self-Made Man | 2001 |
| # 1047 | O’Brien, Kathleen | Babes in Arms | 2002 |
| # 1860 | O’Brien, Kathleen | Betting on the Cowboy | 2013 |
| # 1382 | O’Brien, Kathleen | Christmas In Hawthorn Bay | 2006 |
| # 1411 | O’Brien, Kathleen | Everything But The Baby | 2007 |
| # 1590 | O’Brien, Kathleen | For the Love of Family | 2009 |
| # 1737 | O’Brien, Kathleen | For Their Baby | 2011 |
| # 1950 | O’Brien, Kathleen | Reclaiming the Cowboy | 2014 |
| # 1441 | O’Brien, Kathleen | Texas Baby | 2007 |
| # 1632 | O’Brien, Kathleen | Texas Trouble | 2010 |
| # 1572 | O’Brien, Kathleen | Texas Wedding | 2009 |
| # 1746 | O’Brien, Kathleen | The Cost of Silence | 2011 |
| # 1176 | O’Brien, Kathleen | The Homecoming Baby | 2004 |
| # 1146 | O’Brien, Kathleen | The One Safe Place | 2003 |
| # 1892 | O’Brien, Kathleen | The Ranch She Left Behind | 2013 |
| # 1984 | O’Brien, Kathleen | The Rancher’s Dream | 2015 |
| # 927 | O’Brien, Kathleen | The Real Father | 2000 |
| # 1086 | O’Brien, Kathleen | The Redemption of Matthew Quinn | 2002 |
| # 1231 | O’Brien, Kathleen | The Saint | 2004 |
| # 1920 | O’Brien, Kathleen | The Secrets of Bell River | 2014 |
| # 1249 | O’Brien, Kathleen | The Sinner | 2005 |
| # 1266 | O’Brien, Kathleen | The Stranger | 2005 |
| # 1766 | O’Brien, Kathleen | The Vineyard of Hopes and Dreams | 2012 |
| # 1668 | O’Brien, Kathleen | We Need a Little Christmas | 2010 |
| # 1830 | O’Brien, Kathleen | Wild for the Sheriff | 2013 |
| # 1015 | O’Brien, Kathleen | Winter Baby | 2001 |
| # 1486 | O’Keefe, Molly | A Man Worth Keeping | 2008 |
| # 1460 | O’Keefe, Molly | Baby Makes Three | 2007 |
| # 1365 | O’Keefe, Molly | Family At Stake | 2006 |
| # 1385 | O’Keefe, Molly | His Best Friend’s Baby | 2006 |
| # 1688 | O’Keefe, Molly | His Wife for One Night | 2011 |
| # 1663 | O’Keefe, Molly | The Scandal and Carter O’Neill | 2010 |
| # 1534 | O’Keefe, Molly | The Son Between Them (The Story of Us) | 2008 |
| # 1542 | O’Keefe, Molly | The Story Between Them (And Then There Was You) | 2009 |
| # 1651 | O’Keefe, Molly | The Temptation of Savannah O’Neill | 2010 |
| # 1657 | O’Keefe, Molly | Tyler O’Neill’s Redemption | 2010 |
| # 1432 | O’Keefe, Molly | Undercover Protector | 2007 |
| # 1783 | O’Keefe, Molly | Unexpected Family | 2012 |
| # 1392 | O’Keefe, Molly | Who Needs Cupid?: A Valentine for Rebecca | 2007 |
| # 1510 | O’Keefe, Molly | Worth Fighting For | 2008 |
| # 212 | Orwig, Sara | A Chance in Time | 1986 |
| # 241 | Orwig, Sara | Gypsy Fire | 1986 |
| # 57 | Orwig, Sara | Magic Obsession | 1983 |
| # 563 | Orwig, Sara | The Mad, the Bad and the Dangerous | 1993 |
| # 1943 | Otto, Elizabeth | The Firefighter’s Appeal | 2014 |