Cathy Gillen Thacker

   Marriage by Design (1994) (with others)
   Just Add Children (1995) (with Eva Rutland and Elise Title)
   Yours, Mine and Ours (1997) (with Marisa Carroll and Penny Jordan)
   The Cupid Connection (1998) (with Anne Stuart and Vicki Lewis Thompson)
   In Defense of Love / Her Special Angel / Daddy Christmas / Home for Christmas (1999) (with Kathleen Creighton and Marie Ferrarella)
   The Baby Game (2000) (with Judy Christenberry)
   Western Rogues (2002) (with Annette Broadrick)
   Temporary Santa (2003) (with Leigh Michaels)
   Her Surprise Baby (2004) (with Paula Detmer Riggs)
   My Secret Wife / Their Instant Baby (2004)
   Be My Baby (2005) (with Adrianne Lee)
   Married in White (2005) (with Linda O Johnston)
   Bride Said, Surprise! / Bride Said, Wow! (2005)
   Secret Wedding Wish / the Sugar House (2005) (with Christine Flynn)
   Secret Seduction / Which Child is Mine? (2005) (with Karen Rose Smith)
   Plain Jane's Secret Life / Beauty and the Black Sheep (2005) (with Jessica Bird)
   His Undercover Virgin (2007) (with Lindsay McKenna)
   Their Little Miracles (2007) (with Anne McAllister)
   A Texas Christmas (2007) (with Linda Warren)
     aka A Cowboy Under the Mistletoe / The Christmas Cradle
   His Mistress, His Rules (2009) (with Ann Major and Jamie Sobrato)
   Inherited Twins / Christmas in Key West (2009) (with Cynthia Thomason)
   Millionaire's Christmas Wife / Baby in the Bunkhouse (2009) (with Susan Crosby)
   His Virgin Wife (2010) (with Annette Broadrick and Diana Palmer)
   Mummy Makeover / Mummy for Hire (2010) (with Kristi Gold)
   A Ring for Christmas (2010) (with Margaret Allison and Joan Elliott Pickart)
   The Ultimate Texas Bachelor / Blind Luck Bride (2011) (with Laura Marie Altom)
   The Texas Rancher's Vow / Found: One Baby (2012)
   Cowboys & Babies Volume 1 from Harlequin (2013) (with Laura Marie Altom and Tina Leonard)
   Harlequin American Romance December 2013 Bundle (2013) (with others)
   Harlequin American Romance March 2014 Bundle (2014) (with others)
   Harlequin American Romance July 2014 Bundle (2014) (with others)
   A Proposal at Christmas (2014) (with Leanne Banks)
   Harlequin American Romance December 2014 Box Set (2014) (with others)
   Harlequin American Romance February 2015 Box Set (2015) (with others)
   The Groom Who (Almost) Got Away / The Texas Rancher's Marriage (2015) (with Carla Neggers)
   Harlequin American Romance June 2015 Box Set (2015) (with others)
   Harlequin American Romance November 2015 Box Set (2015) (with others)
   Harlequin Blaze December 2015 Box Set (2015) (with others)
   Harlequin Western Romance July 2016 Box Set (2016) (with others)
   Harlequin Western Romance November 2016 Box Set (2016) (with others)
   Harlequin Western Romance February 2017 Box Set (2017) (with others)
   Harlequin Western Romance June 2017 Box Set (2017) (with others)
   Harlequin Western Romance November 2017 Box Set (2017) (with others)
   Harlequin Western Romance April 2018 Box Set (2018) (with others)
   To Have And To Hold (2018) (with Helen Lacey and Myrna Mackenzie)
   Harlequin Special Edition October 2018 Box Set 1 of 2 (2018) (with Michelle Major and Teresa Southwick)
   Thankful for Love (2018) (with Brenda Harlen and Joanna Sims)
   Twins For Christmas (2018) (with others)
   The Mills & Boon Sparkling Christmas Collection (2018) (with others)
   A Texas Christmas: An Anthology (2018) (with Linda Warren)
   Trusting the Rancher (2019) (with Pamela Britton)
     aka The Rancher Next Door / Winning the Rancher's Heart
   Harlequin Special Edition Apr 2019 Box Set 2 of 2 (2019) (with Marie Ferrarella and Teresa Southwick)
   A Secret Arrangement (2019) (with Lynnette Kent)
   The Cowboy's Surprise (2019) (with Ali Olsen)
   Cinderella's Secret Royal Fling / Their Inherited Triplets (2019) (with Jessica Gilmore)
   Harlequin Special Edition August 2019 - Box Set 1 of 2 (2019) (with Shirley Jump and Melissa Senate)
   Her Cowboy Protector (2019) (with Pamela Britton)
   Home on the Ranch: Texas Holiday Dilemma (2019) (with Judy Duarte)
   Harlequin Special Edition December 2019 - Box Set 1 of 2 (2019) (with Stella Bagwell and Christine Rimmer)
   The Texan's Christmas Bounty (2019) (with Tina Leonard)
   A Cowboy's Best Friend (2020) (with Kathleen Eagle)
     aka Never Trust a Cowboy / The Long, Hot Texas Summer
   Brooding Rebel To Baby Daddy / His Plan For The Quintuplets (2020) (with Ally Blake)
   Harlequin Special Edition July 2020 - Box Set 1 of 2 (2020) (with Laurel Greer and Christine Rimmer)
   Texas Country Legacy: The Baby Connection (2020) (with Ali Olson)
   Family in the Making (2020) (with Melissa Senate)
   Harlequin Special Edition October 2020 - Box Set 1 of 2 (2020) (with Diana Palmer and Christine Rimmer)
   Lone Star Connection (2020) (with Tanya Michaels)
   Texas Country Legacy / All a Cowboy Wants (2020) (with Marie Ferrarella)
   Texas Country Legacy: Lone Star Wishes (2020) (with Linda Warren)
   Claiming the Texan's Heart (2021) (with Tina Leonard)
   Harlequin Special Edition May 2021 - Box Set 2 of 2 (2021) (with Christine Rimmer and Sasha Summers)
   Harlequin Special Edition August 2021 - Box Set 2 of 2 (2021) (with Allison Leigh and Sabrina York)
   His Texas Christmas Gift (2021) (with Meg Maxwell and Nancy Robards Thompson)
   Harlequin Special Edition December 2021 - Box Set 2 of 2 (2021) (with Stella Bagwell and Wendy Warren)
   Harlequin Special Edition June 2022 - Box Set 1 of 2 (2022) (with Allison Leigh and Catherine Mann)
   Their Triple Trouble (2022) (with Melissa Senate)
   A Hero's Homecoming (2022) (with Laura Marie Altom)
   Harlequin Special Edition December 2022 - Box Set 1 of 2 (2022) (with Brenda Harlen and Jo McNally)
   A Temporary Texas Arrangement / Grace And The Cowboy (2023) (with Mary Anne Wilson)
   Harlequin Special Edition January 2024 - Box Set 1 of 2 (2023) (with Kathy Douglass and Mona Shroff)
   Cowboy's Christmas Family (2024) (with Allison Leigh)
   Harlequin Special Edition December 2024 - Box Set (2024) (with others)