Company: WEBNF
Filing Date: 2025-10-15
Form Type: 6-K
Source: 0001104659-25-099445
Chunk: 0

Company: WESTPAC BANKING CORP
Filing Date: 2025-10-15
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

October 15, 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 xForm 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, including the information set forth in Exhibit No. 1, but excluding the information set forth
in Exhibit No. 2 and Exhibit No. 3 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.

Removal of operational risk capital overlay

Westpac acknowledges the
decision by the Australian Prudential Regulation Authority (APRA) to lift its enforceable undertaking and confirm Westpac’s improvement
in risk management.

The removal of the $500 million
capital overlay will mean Westpac’s Common Equity Tier 1 (CET1) capital ratio will increase by approximately 17 basis points, reflecting
a reduction in risk weighted assets of $6,250 million. This change will apply with immediate effect.

Index to Exhibits

| Exhibit 
 No.     |     | Description                                 |
| 1       |     | Removal of operational risk capital overlay |

Disclosure regarding forward-looking statements

The information contained in this Report on Form 6-K
contains statements that constitute “forward-looking statements” within the meaning of section 21E of the U.S. Securities
Exchange Act of 1934.

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