SECURITIES AND EXCHANGE COMMISSION

WASHINGTON D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

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

SECURITIES EXCHANGE ACT OF 1934

For the month of November 2017

Commission File Number: 001-35942

LightInTheBox Holding Co., Ltd.

Tower 2, Area D, Diantong Square

No. 7 Jiuxianqiao North Road

Chaoyang District, Beijing 100015

People’s Republic of China

(Address of principal executive offices)

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

Form 20-F     x  Form 40-F     o

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):     o

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):     o

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes    o No    x

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): N/A

THIS REPORT ON FORM 6-K (OTHER THAN THE SECTION OF EXHIBIT 99.1 HERETO ENTITLED “BUSINESS OUTLOOK”) SHALL BE DEEMED TO BE INCORPORATED BY REFERENCE IN THE PROSPECTUS INCLUDED IN THE REGISTRATION STATEMENT ON FORM F-3 (FILE NO. 333-212007) OF LIGHTINTHEBOX HOLDING CO., LTD. AND TO BE A PART THEREOF FROM THE DATE ON WHICH THIS REPORT IS FURNISHED, TO THE EXTENT NOT SUPERSEDED BY DOCUMENTS OR REPORTS SUBSEQUENTLY FILED OR FURNISHED.

TABLE OF CONTENTS

Exhibits

Exhibit 99.1 — LightInTheBox to Hold 2017 Annual General Meeting on December 15, 2017

Exhibit 99.2 — Notice of Annual General Meeting

2

SIGNATURE

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: November 28, 2017

3

Exhibit 99.1

LightInTheBox to Hold 2017 Annual General Meeting on December 15, 2017

Beijing, China, November 23, 2017 - LightInTheBox Holding Co., Ltd. (NYSE: LITB) (“LightInTheBox” or the “Company”), a global online retail company that delivers products directly to consumers around the world, today announced it will hold its 2017 annual general meeting of shareholders at ICBC Tower, 35/F, 3 Garden Road, Hong Kong on December 15, 2017 at 10:00 a.m., local time.

No proposal will be submitted for shareholder approval at the annual general meeting. Instead, the annual general meeting will serve as an open forum for shareholders to discuss Company affairs with management.

The board of directors of the Company has fixed the close of business on November 21, 2017 as the record date (the “Record Date”) for determining the shareholders entitled to receive notice of the annual general meeting or any adjournment or postponement thereof.

Holders of record of the Company’s ordinary shares at the close of business on the Record Date are entitled to attend the annual general meeting and any adjournment thereof in person.

The Company has filed its annual report on Form 20-F, including its audited financial statements for the financial year ended December 31, 2016, with the U.S. Securities and Exchange Commission (the “SEC”). The Company’s annual report can be accessed on the Company’s website at http://ir.lightinthebox.com, as well as on the SEC’s website at http://www.sec.gov. Shareholders may request a hard copy of the Company’s annual report, free of charge, by contacting the Company at ir@lightinthebox.com.

About LightInTheBox Holding Co., Ltd.

LightInTheBox is a global online retail company that delivers products directly to consumers around the world. The Company offers customers a convenient way to shop for a wide selection of products at attractive prices through its www.lightinthebox.com, www.miniinthebox.com and other websites and mobile applications, which are available in 23 major languages and cover more than 80% of global Internet users.

For more information, please visit www.lightinthebox.com.

Investor Relations Contact

Christensen

Ms. Xiaoyan Su

Tel: +86 (10) 5900 3429

Email: ir@lightinthebox.com

OR

Christensen

Ms. Linda Bergkamp

Phone: +1-480-614-3004

Email: lbergkamp@ChristensenIR.com

Exhibit 99.2

LIGHTINTHEBOX HOLDING CO., LTD.

(incorporated in the Cayman Islands with limited liability)

NOTICE OF ANNUAL GENERAL MEETING

to Be Held on December 15, 2017

NOTICE IS HEREBY GIVEN that an Annual General Meeting (“AGM”) of LightInTheBox Holding Co., Ltd. (the “Company”) will be held at ICBC Tower, 35/F, 3 Garden Road, Hong Kong on December 15, 2017 at 10:00 a.m., local time.

No proposal will be submitted for shareholder approval at the AGM. Instead, the AGM will serve as an open forum for shareholders to discuss Company affairs with management.

The board of directors of the Company has fixed the close of business on November 21, 2017 as the record date (the “Record Date”) for determining the shareholders entitled to receive notice of the AGM or any adjournment or postponement thereof.

Holders of record of the Company’s ordinary shares at the close of business on the Record Date are entitled to attend the AGM and any adjournment thereof in person.

The Company has filed its annual report on Form 20-F, including its audited financial statements for the financial year ended December 31, 2016, with the U.S. Securities and Exchange Commission (the “SEC”). The Company’s annual report can be accessed on the Company’s website at http://ir.lightinthebox.com, as well as on the SEC’s website at http://www.sec.gov. Shareholders may request a hard copy of the Company’s annual report, free of charge, by contacting the Company at ir@lightinthebox.com.