This chapter explains fraud in banks as a critical financial risk arising from deception, manipulation, and misuse of banking systems across products and channels. It highlights the key causes of fraud, including human behavior, weak controls, technological gaps, and global complexities. The chapter provides a structured view of major fraud types such as credit card, loan, cyber, and insider fraud, supported by real-world cases. It also introduces global regulatory frameworks, positioning fraud management as a core governance and risk discipline in modern banking.