Legal papers are the written documents used to start, advance, evidence or resolve legal proceedings or transactions. The expression is descriptive rather than a defined statutory term and is used broadly and flexibly across civil, criminal and administrative practice. In England and Wales, Northern Ireland and Ireland, “legal papers” will typically include claim forms, writs, originating summonses, statements of case (pleadings), affidavits, witness statements, orders, consents, skeleton arguments, opinions, contracts, deeds and other formal instruments. In Scotland, the term covers equivalent court documents such as initial writs, summonses, defences, inventories of productions, affidavits and interlocutors, as well as transactional documents and counsel’s written work. The expression is often used in practice to distinguish formal legal documentation from informal correspondence or internal notes. It is relevant for issues such as service, filing, disclosure, privilege, document management, client care and professional liability. While the precise procedural names of particular documents vary by jurisdiction, the underlying concept of “legal papers” as formal, legally significant written materials is broadly consistent across the UK and Ireland.