Company: WEBNF
Filing Date: 2025-06-10
Form Type: 6-K
Source: 0001104659-25-057969
Chunk: 0

Company: WESTPAC BANKING CORP
Filing Date: 2025-06-10
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE
13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934

June 10, 2025

Commission File Number 1-10167

WESTPAC BANKING CORPORATION

(Translation of registrant’s name into English)

(Address of principal executive office)

Indicate by check mark whether the registrant
files or will file annual reports

under cover of Form 20-F or Form 40-F.

Form 20-F x Form 40-F ¨</div>

Indicate by check mark if the registrant is submitting the Form 6-K
in paper as permitted by Regulation S-T Rule 101(b)(1): ¨

Indicate by check mark if the registrant is submitting the Form 6-K
in paper as permitted by Regulation S-T Rule 101(b)(7): ¨

Incorporation by Reference

The information contained
in this Report on Form 6-K, excluding the information set forth in Exhibit 1, shall be incorporated by reference in the prospectuses
relating to the Registrant’s securities contained in the Registrant’s Registration Statements on Form F-3 (File Nos.
333-283007 and 333-283008), as such prospectuses may be amended or supplemented from time to time.

Appointment of Philippa Greenwood to the Westpac Board

Westpac Banking Corporation
has today announced the appointment of Philippa (Pip) Greenwood as an independent Non-executive Director, subject to regulatory approvals.
Pip is expected to join the Board on or around August 1, 2025.

About Pip Greenwood

Pip has more than 25 years’
experience in capital markets, mergers and acquisitions, telecommunications and governance, and was one of New Zealand’s leading
commercial lawyers and a partner at Russell McVeagh. During her time with Russell McVeagh, Pip also served as Board Chair and interim
CEO.

Pip is the current
Chair of Westpac New Zealand Limited and Chair of The a2 MilkCompany Limited and is a Non-executive Director of Fisher & Paykel Healthcare
Corporation Limited.

Index to Exhibits

| Exhibit 
 No.     |     | Description                                            |
| 1       |     | Appointment of Philippa Greenwood to the