Company: PBR
Filing Date: 2025-09-03
Form Type: 6-K
Source: 0001104659-25-086710
Chunk: 0

Company: PETROBRAS - PETROLEO BRASILEIRO SA
Filing Date: 2025-09-03
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September, 2025

Commission File Number 001-15106

PETRÓLEO BRASILEIRO S.A. - PETROBRAS

(Exact name of registrant
as specified in its charter)

Brazilian Petroleum Corporation - PETROBRAS

(Translation of Registrant's
name into English)

Avenida Henrique Valadares, 28
20241-030 - Rio de Janeiro, RJ
Federative Republic of Brazil

(Address of principal
executive office)</div>

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

This report on Form 6-K is incorporated by reference in the Registration
Statement on Form F-3 of Petróleo Brasileiro S.A. – Petrobras and Petrobras Global Finance
B.V. – PGF .

Exhibit 15.1 — Awareness Letter of KPMG Auditores Independentes.

<div align='center'>SIGNATURE</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.

| PETRÓLEO BRASILEIRO S.A--PETROBRAS |                              |
| By:                                | /s/ Andre Gameiro Rua        |
|                                    | Name: Andre Gameiro Rua      |
|                                    | Title: Attorney-in-fact      |
| By:                                | /s/ Lucas Tavares de Mello   |
|                                    | Name: Lucas Tavares de Mello |
|                                    | Title: Attorney-in-fact      |

Date: September 3, 2025