Colchester Archaeological Trust (CAT) is a leading charity and one of the UK's longest-established archaeological organizations, dedicated to discovering and preserving local heritage. Founded in 1963, CAT boasts extensive experience in urban archaeology, evidenced by significant finds such as Britain’s only Roman circus and the ancient Roman fortress. Operating from their headquarters in Colchester, Essex, the Trust offers a range of commercial archaeological and heritage services for private, commercial, and local authority clients, covering diverse projects from housing developments to pipeline routes.

In addition to professional services, CAT is committed to community engagement and education. The Roman Circus Visitor Centre serves as an interactive hub for anyone interested in archaeology, providing learning opportunities and volunteering programs. The Trust also hosts events, open days, and lectures to deepen public understanding of archaeology and local history. As a registered archaeological organization with the Chartered Institute for Archaeologists, CAT ensures that their work meets the highest standards, contributing to both academic and public knowledge.