This desk top study was commissioned by T. P. Associates Ltd as a preliminary stage to the proposed development of 19-37 Castle Street, Cambridge. The site occupies an area approximately 1450 sq m between Castle Street to the east and St. Peter's Street to the west and includes both street frontages, roughly opposite the Castle mound on the steepest part of the hill slope. The development proposal includes application for planning consent for the construction of a church and student accommodation and will involve extensive rebuilding. In view of the high archaeological potential of the area, the County Archaeological Office advised the Local Planning Authority of the need for the applicant to provide more information on the archaeological implications of the proposed development. In accordance with the Brief issued by the CAO , this desk top assessment will bring together all the currently available information concerning the known and the potential archaeological remains in the immediate area, with a view to predicting the nature, extent and state of preservation of archaeological features within the development zone. The impact of the proposed scheme on the archaeology will be assessed, and this information will contribute in the formulation of any mitigation strategies.