Purpose – The purpose of this paper is to help directors, senior management, and stakeholders of Islamic banks understand shari‘ah risk, a crucial consideration in the corporate governance of Islamic banks, and its impact on these banks.Design/methodology/approach – This conceptual paper links dispersed insights drawn from the emerging body of shari‘ah governance literature, and the guidance issued by the Basel Committee on Banking Supervision (BCBS), the Islamic Financial Services Board (IFSB), and the Accounting and Auditing Organization for Islamic Financial Institutions (AAOIFI) with new insights to clarify the shari‘ah risk that Islamic banks face.Findings – Shari‘ah risk, an operational risk, poses a credible hazard to Islamic banks and their stakeholders. Possible consequences of shari‘ah non-compliance include higher costs, financial losses, liquidity problems, bank runs, bank failure, industry smearing and financial instability. This study defines shariah risk, identifies credit, legal, compliance, market, and reputational risk that it may evoke, and categorizes its causes and events.Research limitations/implications – Future research could empirically test the ideas posited. In this paper claims were substantiated by logic and examples.Practical implications – The study devises an instrument for assessing shari‘ah risk, and suggests measures for directors, senior management, and regulators to mitigate this risk.Originality/value – This is the first study to focus on the implications of shari‘ah risk, delineate examples of events and incorporate them within the BCBS operational risk causes, and develop a tool for measuring shari‘ah risk