Mr John Arthur is the Chairman of Singtel Optus Pty Limited (a subsidiary of Singtel) and a Director of Singtel.

John is a lawyer by training, with experience as advisor, executive and director across a broad range of industries. He was a partner of the law firm Freehills, Group General Counsel of Lendlease Corporation, Chairman of the law firm Gilbert + Tobin, Chairman and CEO of Investa Property Group, Group Executive Counsel & Secretariat and then Chief Operating Officer of Westpac Banking Corporation, before retiring in late 2016. He was a Consultant to the Chief Executive of Westpac until late 2020. He is a former board member of CSR Limited, Rinker Group Limited, Allianz Australia and ME Bank. He also chaired Sydney Metro between 2019 and 2024.

John holds a Bachelor of Laws (Honours) from the University of Sydney.