UNITED STATES

SECURITIES AND EXCHANGECOMMISSION

WASHINGTON, DC 20549

FORM 6-K

REPORT OF FOREIGNPRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIESEXCHANGE ACT OF 1934

For the month of July 2025

Commission File Number: 001-41782

VinFast Auto Ltd.

Dinh Vu – CatHai Economic Zone

Cat Hai Islands, CatHai Town, Cat Hai District

Hai Phong City, Vietnam

(Address of principalexecutive office)

Indicateby 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  ¨

INFORMATIONCONTAINED IN THIS REPORT ON FORM 6-K

VINFAST DELIVERED11,382 ELECTRIC VEHICLES IN VIETNAM IN JUNE 2025

Hanoi, July 11,2025 – VinFast Auto Ltd. (the “Company” or “VinFast”) announced its preliminary domestic Vietnam deliveries of11,382 electric vehicles (“EVs”)¹ in June 2025. In total, the Company has delivered 67,569¹ EVsto customers in Vietnam during the first half of 2025.

VinFast’sdeliveries in June 2025 remained relatively steady month-over-month, enabling the company to maintain its position as the leadingautomaker in Vietnam². Notably, 3,667 VF 3 vehicles¹ were delivered in June 2025, making itVinFast’s best-selling model for the month. The VF 5 followed closely with 3,060 vehicles¹ delivered.Excluding the Green series which is designed for commercial transportation, the VF 6 model ranked third with 1,245 vehicles¹delivered, followed by the VF 7 with 725 vehicles¹ delivered. Two models from the Green series also contributedto the total deliveries in the month, with 1,415 Nerio Green and 916 Herio Green vehicles¹ delivered.

In the first half of 2025,the VF 3 and VF 5 were the two best-selling models in Vietnam with cumulative deliveries of 23,083 and 21,812 vehicles¹,respectively. The Company also delivered 8,552 VF 6 and 3,586 VF 7 vehicles¹ during the period.

In June 2025, VinFastofficially inaugurated its EV manufacturing plant located in the Vung Ang Economic Zone, Ha Tinh. The facility will focus on manufacturingcompact urban EV models, including the VF 3, Minio Green, and EC Van. The plant is expected to produce vehicles for both the domesticVietnam market and international exports.

ThisForm 6-K shall be deemed to be incorporated by reference into the Company’s registration statement on Form S-8 (FileNo. 333-278251) and registration statement on Form F-3 (File No. 333-275133) (including any prospectuses forming a partof such registration statements) and to be a part thereof from the date on which this report is furnished, to the extent not supersededby documents or reports subsequently filed or furnished.

Note 1: Preliminary delivery results are subjectto change and may differ from the final number of deliveries that will be recognized as vehicle sales revenue for the period as a resultof the year end audit.

Note 2: Market and industry statements inthis document are based on data from the Vietnam Automobile Manufacturers' Association and Company internal data (for VinFast only).

About VinFast

VinFast (NASDAQ: VFS) – a subsidiaryof Vingroup JSC – is Vietnam’s leading automotive manufacturer, committed to its mission of creating a green future for everyone.VinFast produces a range of electric SUVs, e-scooters, e-bikes, and e-buses in Vietnam and exports to key markets across Asia, NorthAmerica, and Europe. Learn more at www.vinfastauto.us.

VinFast deliveries represent only one measureof the company’s financial performance and should not be relied on as an indicator of quarterly financial results, which dependon a variety of factors, including the average selling price and various cost components.

SIGNATURE

Pursuant to the requirements of the SecuritiesExchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereuntoduly authorized.