Williams, K. (2022) The suffragette cookbook introduction. In: The Suffragette Cookbook. Hodder Studio, London. ISBN 9781529394153
Williams, K. (2020) Emma Hamilton & Admiral Lord Nelson. In: Peltz, L. and Stewart, L. (eds.) Love stories: art, passion & tragedy. National Portrait Gallery, pp. 150-156. ISBN 9781855147034
Williams, K. (2019) Rival queens: the betrayal of Mary, Queen of Scots. Arrow, pp408. ISBN 9780099549734
Williams, K. (2018) The house of shadows. De Witt chronicles. Orion Publishing, London, pp425. ISBN 9781409139959
Williams, K. and Colville, Q. (2016) Emma Hamilton: seduction and celebrity. Thames & Hudson, pp288. ISBN 9780500252208
Williams, K. (2016) Introduction. In: Sackville-West, V. (ed.) The Edwardians. Vintage. ISBN 9781784870546
Williams, K. (2015) The edge of the fall. Orion, London. ISBN 9781409139911
Williams, K. (2014) The storms of war. Orion. ISBN 9781409139881
Williams, K. (2013) Josephine: desire, ambition, Napoleon. Hutchinson. ISBN 9780091936914
Williams, K. (2012) Young Elizabeth: The Making of Our Queen. W&N.
Williams, K. (2011) The Ring and The Crown: A History of Royal Weddings. Hutchinson, pp189. ISBN 978-0091943776
Williams, K. (2011) The Weakness of Hearts. Litro, 104.
Williams, K. (2011) Introduction to Frederick the Great by Nancy Mitford (Vintage, 2011). In: Frederick the Great. Vintage. ISBN 978-0099528869
Williams, K. (2011) The Pleasures of Men (A Novel). Penguin.
Williams, K. (2010) The Rise of the Novel. In: The History of British Women's Writing 1690–1750. AIAA. ISBN 978-0230549388
Williams, K. (2008) Becoming Queen. Hutchinson.
Williams, K. (2007) Passion in Translation: 1720s Amatory Writers and the Novel. In: Remapping the Rise of the Novel. Voltaire Foundation.
Williams, K. (2005) "Nelson and Women" in Admiral Lord Nelson: Context & Legacy. In: Admiral Lord Nelson: Context & Legacy. AIAA. ISBN 978-1403939067
Williams, K. (2005) Reading Tristram Shandy in the Brothel. The Shandean (16).
Williams, K. (2004) The Force of Language and the Sweets of Love: Eliza Haywood and the Erotics of Reading in Samuel Richardson's Clarissa. Lumen, 23. pp. 309-323.
Williams, K. (2001) England's Mistress: The Infamous Life of Emma Hamilton. Hutchinson.