Exhibit 15

Consent of Independent Registered Public Accounting Firm

We hereby consent to the incorporation by reference in the Registration Statement on Form F-3 (No. 333-207931) of Westpac Banking Corporation of our report dated 7 November 2016 relating to the financial statements and the effectiveness of internal control over financial reporting which appears in this Form 20-F.

/s/ PricewaterhouseCoopers

Sydney, Australia

7 November 2016