Circular RNAs (circRNAs) are unique transcript isoforms characterised by back splicing of exon ends to form a covalently closed loop or circular conformation. These transcript isoforms are now known to be expressed in a variety of organisms across the kingdoms of life. Recent studies have shown the role of circRNAs in a number of diseases and increasing evidence points to their potential application as biomarkers in these diseases. We have created a comprehensive manually curated database of circular RNAs associated with diseases.The database is unique in many ways. Firstly it provides standard disease nomenclature as per the ICD codes. It additionally lists the assay and PCR primer details including experimentally validated ones as a ready reference to researchers. To the best of our knowledge, circad is the most comprehensive and updated database of disease associated circular RNAs.