Lost property refers to tangible personal property that the owner has unintentionally parted with and cannot presently be identified or located. In legal practice in the UK and Ireland, the term is descriptive rather than strictly defined in a single statute, and its treatment is shaped largely by common law and specific legislation on found property and theft.A key distinction is drawn between “lost”, “mislaid”, “abandoned” and “stolen” property, as this affects the rights and duties of finders, occupiers and enforcement authorities. Case law (for example on finders’ rights and occupiers’ liability to found items) guides many disputes, particularly in England & Wales and Northern Ireland. In Scotland, issues are influenced by the law of property and possession, and in Ireland by common law principles and local statutory schemes.Typically, a finder of lost property must take reasonable steps to trace the owner and may have duties to hand items to the police, transport operators or other custodians. Failure to do so, or dishonest appropriation, may constitute theft. Lost property issues arise frequently in commercial premises, public transport, hospitality, local authority practice, and insurance.