Company: LI
Filing Date: 2025-09-08
Form Type: 6-K
Source: 0001104659-25-088054
Chunk: 0

Company: Li Auto Inc.
Filing Date: 2025-09-08
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: 001-39407

Li Auto Inc.

(Registrant’s Name)

11 Wenliang Street

Shunyi District, Beijing 101399

People’s Republic of China

(Address of Principal Executive Offices)</div>

Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or Form 40-F.

<div align='center'>Form 20-F xForm 40-F ¨

EXPLANATORY NOTE</div>

As an issuer listed on The Stock Exchange of Hong
Kong Limited, we are required to prepare an interim report in respect of the first six months of each fiscal year pursuant to Rule 13.48(1) of
the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited. We are furnishing our interim report in
respect of the first six months of the fiscal year ending December 31, 2025 as Exhibit 99.1 of this current report on Form 6-K.

<div align='center'>EXHIBIT INDEX</div>

| Exhibit No. |     | Description                      |
| 99.1        |     | Li Auto Inc. 2025 Interim Report |

<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.

| Li Auto Inc. |   |                                      |
| By           |   | /s/ Tie Li                           |
| Name         | : | Tie Li                               |
| Title        | : | Director and Chief Financial Officer |

Date: September 8, 2025