This Practice Note considers the concept of dishonesty in the criminal law. Dishonesty is a state of mind which is relevant in several offences. Without this essential element in offences such as theft, for example, the offence cannot be committed. Dishonesty is not fully defined in statute and the courts have sought to lay down a test for the jury to apply. This Practice Note considers the test for dishonesty as set out by the Court of Appeal in R v Ghosh and the redefined test established by the UK Supreme Court (UKSC) in Ivey v Genting Casinos (UK) Ltd. It also covers how the discussion by the UKSC, albeit technically obiter dicta, is considered binding by the Court of Appeal in its judgment in R v Barton, R v Booth. It covers the objective nature of the test and how this is applied to market practice.