Here's a snapshot of what I think is published for the first time in February 2023 (and is usually a UK date but occasionally will be a US or Australian date). February and future months can be found on the Future Releases page. If I've missed anything or got the date wrong, do please leave a comment.
Please note that, unless specifically mentioned, when a book has differing print and ebook release date, I use the print release date. Translators' names are included where known.
Via the Future Releases page you can now filter the books published in 2023 (in the UK) by All, Anthology, First Novel, Historical and Translated.
• Abbott, Rachel - No More Lies #11 DI Tom Douglas• Ace, Cathy - The Case of the Cursed Cottage #7 A Wise Enquiries Agency Mystery
• Alsterdal, Tove - You Will Never Be Found tr. Alice Menzies #2 Detective Eira Sjödin
• Amphlett, Rachel - The Dying Season #12 Detective Kay Hunter
• Baker, Tina - Make Me Clean
• Beaton, M C (with R W Green) - Death of a Traitor #36 PC Hamish Macbeth, Lochdubh, Scotland
• Brannigan, Ellie - Murder at an Irish Castle #1 Rayne McGrath
• Bruce, Camilla - The Witch in the Well
• Burnside, Heather - Blackmail #2 Manchester Thrillers
• Butler, D S - Find Her Alive #7 DS Karen Hart, Lincolnshire
• Campos, Simone - Nothing Can Hurt You Now tr. Rahul Bery
• Candlish, Louise - The Only Suspect
• Chester, Fliss - Death by a Cornish Cove #2 Cressida Fawcett, 1920s
• Clarke, Sarah - My Perfect Friend
• Comley, M A - To Control Them #8 DI Sam Cobbs
• Craig, James - Sink or Swim #17 Inspector John Carlyle
• Croft, Kathryn - The Suspect
• Crombie, Deborah - A Killing of Innocents #19 Duncan Kincaid and Gemma James, Scotland Yard
• Cross, A J - Reflections of Deviance #4 Will Traynor, Criminologist
• Dalgliesh, J M - Dead To Me #13 Tom Janssen, Norfolk
• Daws, N R - A Perfect Time to Murder #3 Lizzie Hayes, Pilot & DI Jonathan Kember, 1940
• Durrant, Helen H - The Wrong Woman #3 Detectives Lennox & Wilde
• Ellis, Bella - A Gift of Poison #4 The Brontë Mysteries
• Engberg, Katrine - The Sanctuary (apa The Island) tr. Tara Chace #4 Jeppe Korner and Anette Werner,Police, Copenhagen
• Fairfax, John - Fatal Proof #4 William Benson and Tess de Vere, Lawyers
• Flint, Emma - Other Women
• Gatland, Jack - The Boardroom
• Gatward, D J - The Dark Hours (ebook only) #13 DCI Harry Grimm
• Gerlis, Alex - Agent in the Shadows #3 The Wolf Pack Spies
• Gibney, Patricia - Three Widows #12 Detective Lottie Parker
• Goodhind, J G - Marriage Is Murder #11 Honey Driver, Hotelier, Bath
• Gray, Alex - Questions for a Dead Man #20 DCI Lorimer & psychologist Solomon Brightman, Glasgow
• Hamer, Kate - The Lost Girls #2 Carmel
• Harrod-Eagles, Cynthia - Before I Sleep #24 Bill Slider, Shepherd's Bush CID
• Hendy, Hannah - A Terrible Village Poisoning #3 The Dinner Lady Detectives
• Hindle, Tom - The Murder Game
• Hunter, Evie - A Date To Die For (as E V Hunter) #1 Hopgood Hall Murder Mysteries
• Keane, Jessie - Never Go Back
• Kirk, JD - One For the Ages (ebook only) #16 DCI Logan
• Koch, Emily - What July Knew
• Koning, Christina - The Blind Detective (also pub. as Line of Sight by A C Koning in 2014) #1 The Blind Detective, 1920s
• Lincoln, John - Grey in the Dark #2 Gethin Grey
• Lloyd, Chris - Paris Requiem #2 Detective Eddie Giral, Paris, 1940
• MacBride, Stuart - The Dead of Winter
• Markin, Wes - The Lonely Lake Killings #2 DCI Emma Gardner, Yorkshire
• Mason, Simon - The Broken Afternoon #2 DI Ray Wilkins, Oxford
• McCleave, Simon - The Llandudno Pier Killings #14 DI Ruth Hunter
• McDermott, Alan - Empires Will Fall (ebook only) #5 Eva Driscoll
• McLean, Rachel - The Blue Pool Murders #7 DCI Lesley Clarke, Dorset
• Mount, Toni - The Colour of Bone #11 Sebastian Foxley Medieval Murder Mystery
• Murphy, Margaret - The Scarecrow Killer #2 DC Cassie Rowan, Liverpool
• Parker, Steve - Slaughtered As They Slept #9 Detective Ray Paterson
• Rayne, Sarah - Chalice of Darkness #1 Theater of Thieves, London 1908
• Scarrow, Simon - Dead of Night #2 Criminal Inspector Horst Schenke
• Seeck, Max - The Last Grudge tr. tbc #3 Jessica Niemi
• Sheehan, Bilinda P - Lake of Tears (ebook only) #7 Harriet Quinn
• Shindler, Will - The Blood Line #4 DI Alex Finn & DC Mattie Paulsen, London
• Shrager, Rosemary - The Proof in the Pudding #2 Prudence Bulstrode, Retired Chef
• Smith, Alexander McCall - The Private Life of Spies - Short Stories
• Smith, Anna - If I Should Die #2 Billie Carlson, Glasgow
• Speechley, Ruby - Gone
• Stacey, L H - The Weekend
• Stockham, Alison - The Cuckoo Sister
• Takamura, Kaoru - Lady Joker, Volume 2 tr. Allison Markin Powell & Marie Iida
• Templeton, Aline - Blind Eye #5 DI Kelso Strang
• Waller, Anita - Fatal Secrets #1 Forrester Family
• White, S R - Red Dirt Road
• Yarwood-Lovett, Sarah - A Mischief of Rats #3 Nell Ward