This Practice Note considers the availability of security for claims (or security for claim or security for a claim) in international arbitral (arbitration) proceedings. The Practice Note addresses what is security for claim(s), how does security for claims differ from security for costs, the availability of security for claims in ad hoc and institutional arbitration and under selected national arbitration laws, notably the Arbitration Act 1996 in England and Wales, the French Code of Civil Procedure, the Hong Kong Arbitration Ordinance (CAP 609), and the Singapore International Arbitration Act. The Practice Note considers applications to arbitral tribunals and to courts, and the orders for security that may be obtained from them, including the arrest of property. The Practice Note also provides some guidance on the criteria for obtaining security for claims, such as material change of circumstances and location of assets, and it contains practical tips.