Authors with last names beginning with O:
E. L. Oakes – The Cypress Mountain Mysteries
Elizabeth Oakey – The Mrs Mortimer Mysteries
Rosalie Oaks – The Lady Diviner Mysteries
Rebecca O’Bea – The Backyard Beekeeping Mysteries
Ellie Oberth – The Hazel Cartbell Mysteries, The Storage Auction Mysteries
Jennifer Oberth – The Ella Westin Mysteries, The Georgia H. Mysteries
Emily Oberton – The Hadley Home Design Mysteries
Cherie O’Boyle – The Winslow & Fitzgerald Mysteries
Jane T. O’Brien – The Avery Fox Mysteries, The Cassandra Cross Mysteries, The Jessica Gray Mysteries, The Katie McDougal Mysteries, The Molly Ryan Mysteries, The Rebecca Snow Mysteries, The Sarah Delaney Mysteries, The Tracy Scott Mysteries
R. K. O’Brien – The Joanna Davis Mysteries
Robert O’Brien – The Golden Spike Mysteries
Carlene O’Connor – The Home to Ireland Mysteries, The Irish Village Mysteries
K. E. O’Connor – The Crypt Witch Mysteries, The Fireside Mysteries, The Holly Holmes Mysteries, The Lorna Shadow Ghost Mysteries, The Magical Misfits Mysteries, The Old Sarum Witch Mysteries, The Witch Haven Mysteries, The Zee Town Mysteries
Clare O’Donohue – The Someday Quilts Mysteries
D. R. Oestreicher – The Mr. Szilard Substitute Teacher Mysteries
Leslie O’Kane – The Book Club Trilogy, The Ghost Mom Mysteries, The Molly Masters Mysteries
Katie O’Keene – Designer to the Dead
Bonnie Oldre – The Beth and Evie Mysteries
Alison O’Leary – The Cat Noir Mysteries
Susan O’Leary – The Zoe & Trudie Mysteries
Gloria Oliver – The Daiyu Wu Mysteries
Katie Oliver – The Jane Austen Tea Society Mysteries
Kelly Oliver – The Fiona Figg Mysteries, The Fiona Figg & Kitty Lane Mysteries
Karen E. Olson – The Tattoo Shop Mysteries
Aubry Olsson – The Written In Riddles Mysteries
Kimberley O’Malley – The Addie Foster Mysteries
Tricia O’Malley – The Althea Rose Mysteries
Sam Oman – The Judith Spears Mysteries
Sister Carol Anne O’Marie – The Sister Mary Helen Mysteries
Candice O’Meara – The Ruby Hartwell Mysteries
Peggy O’Neal Peden – The Nashville Mysteries
Carlene O’Neil – The Cypress Cove Mysteries
M. J. O’Neill – The Second Chance Inn Mysteries
Rachelle Orcelletto – The Cascade Canine Club Mysteries
Diana Orgain – The Cooking up Murder Mysteries, The Gold Strike Mysteries, The iWitch Mysteries, The Killer Foursome Mysteries, The Love or Money Mysteries, The Maternal Instincts Mysteries, The Roundup Crew Mysteries, The ScrapBooking Mysteries
Emily Organ – The Augusta Peel Mysteries, The Churchill and Pemberley Mysteries
Jayne Ormerod – The Blonds at the Beach Mysteries, The Mutt Mysteries
Elaine L. Orr – The Family History Mysteries, The Jolie Gentil Mysteries, The Logland Mysteries, The River’s Edge Mysteries
M. L. Ortega – The Conditions Mysteries
Sarah Osborne – The Ditie Brown Mysteries, The Flo and Maude Christmas Mysteries
Richard Osman – The Thursday Murder Club Mysteries
Kathryn O’Sullivan – The Colleen McCabe Mysteries
Gail Oust – The Bunco Babes Mysteries, The Kate McCall Mysteries, The Spice Shop Mysteries
Gwen Overland – The Millicent Winthrop Mysteries
Betty Thomason Owens – The Visitor Mysteries
Janie Owens – The 50-Plus Condo Mysteries
Wendy Owens – The Penny Preston Mysteries
Bee Oxberry – The Durham Dog Walker Mysteries