Resources recording ongoing and completed clinical trials are increasing and they represent challenges in identification and rapid searching. It is difficult to know how to efficiently search each resource. This resource lists trials and research registers and provides a quick reference guide to the search basics for each resource.
Ongoing trials and other research and research results are important to a wide range of people: patients, researchers, funders and the commercial sector.
This web site was first developed following three training days in 2009 presented by Julie Glanville and Carol Lefebvre (Independent Information Consultants). Course participants assisted with the preparation and checking of the data and are gratefully acknowledged.
Since 2009, this website has been regularly updated by Julie Glanville and Carol Lefebvre.
We are grateful to Danielle Varley and Karen Bartlett for past help in editing the website.
If you would like to suggest registers to add to this resource please send the details to Julie Glanville.
Links to registers and guides for searching the registers
Clinical trials registers, databases and portals
Machine learning and artifical intelligence (AI) in relation to clinical trial data
Publications about searching for trials and trial data, trial initiatives
How to cite this site
Finding clinical trials, research registers and research results [Internet]. Glanville J, Lefebvre C, editors. York (UK). 2009 [updated 8 Apr 2025; cited 15 Aug 2025]. Available from https://sites.google.com/a/york.ac.uk/yhectrialsregisters
Recent changes (8 April 2025)