This Practice Note considers arbitrating under (pursuant or subject to) the arbitration rules of the Australian Centre for International Commercial Arbitration (ACICA). It provides background information on the institution and its most recent arbitration rules in force from 1 April 2021. The Practice Note provides an overview of (or introduction to) an arbitration proceeding under the ACICA rules. It considers: what is ACICA; the ACICA Arbitration Rules 2021; preliminary considerations in ACICA arbitration, drafting and filing the notice of arbitration, responding to the notice of arbitration, consolidation in ACICA proceedings, determining the seat in ACICA proceedings, appointment of the tribunal, procedure in ACICA arbitration, ACICA awards, fees and ACICA’s role in ad hoc arbitrations.