Organised financial crime is structured, ongoing financial criminal activity carried out by a group of individuals who work together to commit serious illegal acts for financial gain, often using corruption, intimidation, violence, or fraud to protect their operations and avoid law enforcement. These groups typically have a hierarchy or clear roles, operate over an extended period, and may infiltrate legitimate businesses or public institutions to launder money and expand their influence. This chapter illustrates the types of organised financial crimes, including money laundering, high-profile corporate scandals, Ponzi and pyramid schemes, and identity theft. Moreover, this chapter illustrates the role that a forensic accountant plays in detecting and deterring each type of these organised financial crimes.