Company: WEBNF
Filing Date: 2025-04-30
Form Type: 6-K
Source: 0001104659-25-041695
Chunk: 0

Company: WESTPAC BANKING CORP
Filing Date: 2025-04-30
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

April 30, 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’s Half Year 2025 (1H25) Notable Items and Reporting Changes |

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: April 30, 2025 | WESTPAC BANKING CORPORATION 
 (Registrant)                
 By:                         | /s/               
 Esther Choi       |
|:---------------------|:----------------------------|:------------------|
|                      |                             | Esther Choi       |
|                      |                             | Tier One Attorney |