U
- Ultra Violet - Ellen Henderson, 2005 (Silhouette Bombshell #64)
- Unacceptable Offer, An - Mary Balogh, 1988 (Signet)
- Unauthorized Passion - Amanda Stevens, 2004 (Harlequin Intrigue)
- Unbreakable Bond, An - Robyn Donald, 1986 (Harlequin Presents)
- Unbroken Marriage, An - Penny Jordan, 1982 (Harlequin Presents)
- Unbuttoned By Her Maverick Boss - Natalie Anderson, 2010 (Mills & Boon Modern Heat)
- Uncertain Magic - Laura Kinsale, 1987 (Re-issued 1997 and 2004) (Avon)
- Unchained Destinies - Sara Wood, 1996 (Harlequin Presents)
- Unconditional Surrender - Joanna Wayne, 2001 (Harlequin Intrigue)
- Uncontrollable - Susan Kearney, 2005 (Harlequin Blaze)
- Undead And Unwed - MaryJanice Davidson, 2004 (Berkley Sensation)
- Undead And Unemployed - MaryJanice Davidson, 2004 (Berkley Sensation)
- Undead And Unappreciated - MaryJanice Davidson, 2005 (Berkley Sensation)
- Undead And Unreturnable - MaryJanice Davidson, 2005 (Berkley Sensation)
- Undead And Unpopular - MaryJanice Davidson, 2006 (Berkley Sensation)
- Undead And Uneasy - MaryJanice Davidson, June 2007 (Berkley)
- Undeniable - Multiple Authors
- Undeniable Proof - B.J. Daniels, 2006 (Harlequin Intrigue)
- Under A Wild Sky - Sasha Lord
- Under Control - Natalie J. Damschroder, 2006 (Amber Quill Press)
- Under Cover - MaryJanice Davidson, 2003 (Brava)
- Under Cover Of Night - Multiple Authors
- Under His Spell - Multiple Authors
- Under Surveillance - Gayle Wilson, 2003 (Harlequin Intrigue)
- Under Suspicion - Rachel Lee, 2001
- Under The Knife - Tess Gerritsen, 1990 (Harlequin Intrigue)
- Under The Microscope - Jessica Andersen, 2006 (Harlequin Intrigue)
- Under The Mistletoe - Multiple Authors
- Under The Spaniard's Lock And Key - Kim Lawrence, 2010 (Mills & Boon Modern Romance #983)
- Under The Western Sky - Laurie Paige, 2006 (Silhouette Special Edition)
- Under Venice - Madelyn Sanders, 1991 (Harlequin Intrigue)
- Undercover - Multiple Authors
- Undercover Affair - Multiple Authors
- Undercover Avenger - Rita Herron, 2004 (Harlequin Intrigue)
- Undercover Baby - Multiple Authors
- Undercover Babies - Alice Sharpe, 2005 (Harlequin Intrigue)
- Undercover Bride - Kylie Brant, 2000 (Silhouette Intimate Moments)
- Undercover Christmas - B.J. Daniels, 1997 ((Harlequin Intrigue)
- Undercover Colorado - Cassie Miles, 2006 (Harlequin Intrigue)
- Undercover Commitment - Kathleen Long, 2008 (Harlequin Intrigue)
- Undercover Cowboy - Beverly Bird, 1996 (Silhouette Intimate Moments)
- Undercover Dad - Charlotte Douglas, 1999 ((Harlequin Intrigue)
- Undercover Daddy - Multiple Authors
- Undercover Encounter - Rebecca York, 2004 ((Harlequin Intrigue)
- Undercover Fiance - Sheryl Lynn, 1999 ((Harlequin Intrigue)
- Undercover Lover - Kylie Brant, 1998 (Silhouette Intimate Moments)
- Undercover Marriage - Amy J. Fetzer, 2004 ((Harlequin Intrigue)
- Undercover Nanny - Wendy Warren, 2005 (Silhouette Special Edition)
- Undercover Nightingale - Wendy Rosnau, 2006 (Silhouette Intimate Moments)
- Undercover Princess - Suzanne Brockmann, 1999
- Undercover Protector - Multiple Authors
- Undercover Sheik - Dana Marton, 2006 (Harlequin Intrigue)
- Undercover Vows - Judi Lind, 1996 (Harlequin Intrigue)
- Undercover Wife - Debra Webb, 2003 (Harlequin Intrigue)
- Undercurrents - Stella Cameron, 1991
- Undressing Mercy - Deanna Lee, 2006
- Undying Laughter - Kelsey Roberts, 1995 (Harlequin Intrigue)
- Undying Love - Carole Mortimer, 1983 (Harlequin Presents)
- Unexpected - Multiple Authors
- Unexpected Babies - Anna Adams, 2001 (Harlequin Superromance #997)
- Unexpected Family - Cathy Gillen Thacker, 1991 (Harlequin American Romance)
- Unexpected Father - Multiple Authors
- Unfinished Business - Multiple Authors
- Unfinished Business With The Duke - Heidi Rice, 2010 (Mills & Boon Modern Heat)
- Unforgettable - Multiple Authors
- Unforgettable Man, A - Penny Jordan, 1996 (Harlequin Presents)
- Unforgettable Night - Kelsey Roberts, 1998 (Harlequin Intrigue)
- Unknown Daughter, The - Anna DeStefano, 2004 (Harlequin Superromance)
- Unknown Twin, The - Kathryn Shay, 2004 (Harlequin Superromance)
- Unknown Woman, The - Laurie Paige, 2006 (Harlequin Hotel Marchand #3)
- Unlawfully Wedded - Kelsey Roberts, 1995 (Harlequin Intrigue)
- Unlikely Partners - Jacqueline Diamond, 1987 (Harlequin American Romance)
- Unmarked Man - Darlene Scalera, 2003 (Harlequin Intrigue)
- Unmasked - Multiple Authors
- Unraveled - Multiple Authors
- Unscheduled Love - Beverly Sommers, 1983 (Harlequin American Romance)
- Unspoken Confessions - Kelsey Roberts, 1995 (Harlequin Intrigue)
- Unspoken Desire - Penny Jordan, 1991 (Harlequin Presents)
- Unspoken Longings - Dana Daniels, 1985 (Second Chance At Love #302)
- Unspoken Past - Linda Randall Wisdom, 1983 (Silhouette Special Edition)
- Unspoken Years, The - Lynne Hugo, 2006 (Harlequin Next)
- Unsung Hero, The - Suzanne Brockmann, 2000 (Ivy)
- Unsuspected Conduct - Elaine K. Stirling, 1985 (Harlequin Intrigue)
- Unsuitable Match, An - Multiple Authors
- Untameable Rogue - Kelly Hunter, 2010 (Mills & Boon Modern Heat)
- Untamed - Multiple Authors
- Untamed Billionaire, Undressed Virgin - Anna Cleary, 2008 (Mills & Boon Modern Heat)
- Untamed Cowboy - Pam Crooks, 2007 (Harlequin Historical)
- Untamed Desire - Multiple Authors
- Untamed Heart - Multiple Authors
- Untamed Italian, Blackmailed Innocent - Jacqueline Baird, 2010 (Mills & Boon Modern Romance #954)
- Untamed Possession - Andrea Davidson, 1983 (Harlequin American Romance)
- Untie My Heart - Judith Ivory, 2002
- Until Forever - Multiple Authors
- Untouched - Multiple Authors
- Until You - Multiple Authors
- Untouched - Multiple Authors
- Unwilling Betrothal - Christine James, 1980 (Mills and Boon Historical Romance)
- Unwilling Bride, An - Jo Beverley, 1992
- Unwilling Bride, The - Multiple Authors
- Unwilling Bridegroom, The - Roberta Leigh, 1977 (Mills & Boon Romance #1231)
- Unwilling Conquest, An - Stephanie Laurens, 1996
- Unwilling Desire, A - Carole Mortimer, 1985 (Harlequin Presents)
- Unwilling Mistress, The - Carole Mortimer, 2004 (Harlequin Presents)
- Unwitting Accomplice - Tina Vasilos, 1987 (Harlequin Intrigue)
- Unwrapped - Multiple Authors
- Up Against The Wall - Julie Miller, 2007 (Harlequin Intrigue)
- Upstairs At Miss Hattie's - Ken Casper, 2007 (Harlequin Everlasting Love #15)
- Urban Legend - Erica Orloff, 2004 (Silhouette Bombshell #8)
- Urban Sensation - Debra Webb, 2005 (Harlequin Intrigue)
- Urgent Vows - Joyce Sullivan, 2000 (Harlequin Intrigue)
- Useful Affair, A - Stella Cameron, 2004
