Company: WEBNF
Filing Date: 2025-08-14
Form Type: 6-K
Source: 0001104659-25-077854
Chunk: 0

Company: WESTPAC BANKING CORP
Filing Date: 2025-08-14
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

August 14, 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, 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.

The financial information
for the three months ended June 30, 2025 has not been audited or reviewed by any independent registered public accounting firm and has
been derived from the unaudited financial statements for the quarterly period ended June 30, 2025. Any other financial information provided
as at a date after March 31, 2025 has not been reviewed by any independent registered public accounting firm either. The information
contained in this Report is based on management’s current information, including management’s view of a wide variety of significant
business, economic and competitive risks and uncertainties. Certain data herein may involve underlying estimates, assumptions and judgments
when applying accounting policies and preparing its financial statements, particularly in connection with the calculation of provisions.
Any change in such estimates, assumptions and/or judgments resulting from new information or from changes in circumstances