Company: WEBNF
Filing Date: 2025-05-05
Form Type: 6-K
Source: 0001104659-25-044305
Chunk: 0

Company: WESTPAC BANKING CORP
Filing Date: 2025-05-05
Form: 6-K
Chunk 0
---
<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

May 5, 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       |     | Westpac 1H25 Presentation and Investor Discussion Pack |
| 2       |     | Dividend/Distribution – WBC                            |

<div align='center'>SIGNATURES</div>

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: May 5, 2025 | WESTPAC BANKING CORPORATION 
 (Registrant)                
 By:                         | /s/ Esther Choi   |
|:------------------|:----------------------------|:------------------|
|                   |                             | Esther Choi       |
|                   |                             | Tier One Attorney |