Court costs are the expenses associated with bringing or defending legal proceedings, excluding the professional fees of solicitors and counsel unless specifically included by rule or order. They typically cover court filing fees, hearing fees, service of documents, witness expenses, expert fees, and certain enforcement costs. In England and Wales and Northern Ireland, the term is often used interchangeably with “costs” in civil procedure, though the Civil Procedure Rules and court rules usually refer simply to “costs”, which may include both court fees and legal representatives’ charges. In Scotland, “judicial expenses” is the more common expression, while in Ireland “costs” and “outlay” are used, with court fees forming part of those costs. Court costs are usually subject to the court’s discretion and may follow the event (the loser pays the winner’s costs), be reserved, or be made the subject of specific costs orders or taxation/detailed assessment. They are central to litigation risk assessment, access to justice, and costs budgeting, and are treated in legislation, rules of court and case law across all four jurisdictions in broadly similar ways, though terminology and procedure differ.