Chittagong Hill Tracts Regulation, 1900 (Act 1 of 1900) popularly known as Chittagong Hill Tracts manual is a manual enacted by the then British India Government describing how to administer Chittagong Hill Tracts of present-day eastern Bangladesh. It was adopted in place of earlier manuals, after the government realised that the act of 1860 would not work satisfactorily. Since the adoption of the manual, the administration of Chittagong Hill Tracts was carried on in accordance with the rules of the manual.