This Practice Note considers the various ethical standards that may apply in international arbitration proceedings and the impact of those differing standards on various stages of the arbitration process such as witness preparation, disclosure and communications between the parties and the arbitrators (or arbitral tribunal). The Practice Note also covers the arbitrator’s role in ethical decisions and the impact of the IBA Guidelines on Party Representation in International Arbitration, the LCIA General Guidelines and the AAA/ICDR Standards of Conduct for Parties and Representatives. The Note considers the role and regulation of counsel in international arbitration duties and ethics.