A legal duty is an obligation recognised and enforceable by law, requiring a person or entity to act in a certain way or to refrain from certain conduct. In UK and Irish legal practice it underpins liability in areas such as negligence, contract, statutory compliance, fiduciary relationships and public law.Legal duties may arise from statute (for example, health and safety legislation, company law, equality legislation), from common law or case law (such as the duty of care in tort/delict), or from agreement (contractual duties). Breach of a legal duty may give rise to civil liability, regulatory sanction or, where specified by legislation, criminal liability.Across England and Wales, Scotland, Northern Ireland and Ireland, the concept is broadly consistent, though terminology differs (for example, tort in most UK jurisdictions and Ireland, delict in Scots law). Courts in all four jurisdictions analyse whether a legal duty exists, its scope, to whom it is owed and the standard required. Identifying a relevant legal duty, and evidencing its breach, is central to advising on risk, drafting contracts and pleadings, and assessing prospects in litigation and regulatory investigations.