Company: WEBNF
Filing Date: 2025-11-03
Form Type: 6-K
Source: 0001104659-25-105139
Chunk: 0

Company: WESTPAC BANKING CORP
Filing Date: 2025-11-03
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

November 3, 2025

Commission File Number 1-10167

(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): ¨

Index to Exhibits

| Exhibit 
 No.     |     | Description                                                    |
| 1       |     | ASX Release – Westpac 2025 Group Annual Report and Appendix 4E |

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

| Date: November 3, 2025 | WESTPAC BANKING CORPORATION 
 (Registrant)                
 By:                         | /s/ Esther Choi   |
|:-----------------------|:----------------------------|:------------------|
|                        |                             | Esther Choi       |
|                        |                             | Tier One Attorney |