She is a Fellow and a Director of Studies in History at Fitzwilliam College at the University of Cambridge. She received her BA, MA and PhD from Cambridge, the latter being a study of royal patronage under King Richard III of England. She studied for this at Newnham College under the supervision of G.L. Harriss, whose suggestion it had been, and it was awarded in March 1977. More recently, her interests have expanded into the relationship between local- and central government, the Black Death, medieval female authority, and queenship. As well as lecturing full-time at Cambridge, she also lectures privately and for high schools, and campaigned against the dissolution of the AS Level in 2013.
During the 2012-15 controversy surrounding the burial place of the recently discovered bones of Richard III, she supported the claim of York to be the most fitting final resting place for the last Plantaganet king, saying that the dead king's "self-identification with the North is reflected in his plans for a chantry of 100 priests in York Minster, where he surely hoped to be buried."
She is a Fellow of the Royal Historical Society and General Editor of the Cambridgeshire Records Society. and is a general editor for The Parliament Rolls of Medieval England project, which transcribed, translated, and published digitally and in print, the Rolls of Parliament.
- Cambridge Social History of England, 1200–1500 editor with Mark Ormrod (Cambridge, 2006).
- Much Heaving and Shoving: Late-Medieval Gentry and their Concerns: Essays for Colin Richmond editor, with Margaret Aston (Chipping, 2005).
- ‘Service’ in Fifteenth Century Attitudes: Perceptions of Society in Late Medieval England, and editor, (Cambridge, 1994).
- ‘Personality and Politics’ in The Wars of the Roses: Problems In Focus, ed. A.J. Pollard (Basingstoke, 1995).
- Richard III: A Study of Service (Cambridge, 1989).
- Horrox, R.E., The Extent and Use of Crown Patronage under Richard III (unpublished PhD, Cambridge University, 1977), ii
- "Dr Rosemary Horrox". Retrieved 9 April 2016.
- "University of Cambridge Institute of Continuing Education - University of Cambridge Institute of Continuing Education". Retrieved 9 April 2016.
- "Dr. Rosemary E. Horrox". Retrieved 9 April 2016.
- "Manchester University Press - The Black Death". Manchester University Press. Retrieved 9 April 2016.
- "Wuffing Education for Anglo-Saxon Day Schools at Sutton Hoo". Retrieved 9 April 2016.
- "Spring Meeting". Hertfordshire Association for Local History. Retrieved 9 April 2016.
- "Dr Rosemary Horrox – Medieval Queenship". Retrieved 9 April 2016.
- "AS-levels must not be scrapped". Telegraph.co.uk. 30 January 2013. Retrieved 9 April 2016.
- "A sordid song and dance over Richard III's bones". Telegraph.co.uk. 24 September 2013. Retrieved 9 April 2016.
- Christopher Howse, A sordid song and dance over Richard III’s bones, Telegraph (September 24, 2013).
- "Archived copy" (PDF). Archived from the original (PDF) on 4 March 2016. Retrieved 5 September 2015.CS1 maint: archived copy as title (link)
- "Cambridgeshire Records Society". Retrieved 9 April 2016.
- This web site is designed and hosted Biznetix - Your Business Internet Experts. "The Parliament Rolls of Medieval England, 1275–1504 (Edited by Rosemary Horrox) 9781843837992 - Boydell & Brewer". Boydell & Brewer.
- "Parliament Rolls of Medieval England".