An agricultural lien is a security interest over agricultural products, livestock or related proceeds, granted to secure payment of a debt arising from farming activities (for example, loans, supplies, services or rent). In legal practice it describes any charge or encumbrance over a farmer’s crops, animals, machinery or farming inputs, whether created by contract, statute or common law.In the UK and Ireland the expression is descriptive rather than a uniformly defined statutory term. The underlying rights will usually arise under general security law (for example, fixed and floating charges, pledges or liens), retention of title clauses, or specific statutory regimes affecting agricultural produce and co‑operative marketing.Key issues for practitioners include: attachment and perfection/creation of the security; priority against other secured creditors and landlords; interaction with insolvency, bankruptcy or sequestration; and enforceability on sale or slaughter of livestock or harvest of crops.Usage is broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, but the detailed rules differ: for example, Scotland’s law of moveable security and landlord hypothec, and Ireland’s Companies Act and agricultural charges practice. Careful jurisdiction‑specific analysis is required when drafting, registering or enforcing an agricultural lien.