SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 24, 2016

LYONDELLBASELL INDUSTRIES N.V.

(Exact Name of Registrant as Specified in Charter)

(Addresses of principal executive offices)

(Registrant’s telephone numbers, including area codes)

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On February 24, 2016, LyondellBasell Industries N.V. (the “Company”) and its wholly owned subsidiary, LYB International Finance II B.V. (the “Issuer”), entered into an Underwriting Agreement (the “Underwriting Agreement”) with Barclays Bank PLC, Deutsche Bank AG, London Branch, ING Bank N.V. and Morgan Stanley & Co. International plc, as representatives of the several underwriters named therein (the “Underwriters”), relating to the underwritten public offering and sale by the Issuer of €750 million aggregate principal amount of 1.875% Guaranteed Notes due 2022 (the “Notes”). The Notes are fully and unconditionally guaranteed by the Company. The Underwriting Agreement includes the terms and conditions for the issuance and sale of the Notes, indemnification and contribution obligations and other terms and conditions customary in agreements of this type. The Notes will be issued under an indenture to be dated as of March 2, 2016, between the Company, the Issuer and Deutsche Bank Trust Company Americas, as trustee (the “Indenture”). The terms of the Notes and the guarantee by the Company will be set forth in an officer’s certificate of the Issuer delivered pursuant to the Indenture. Closing of the issuance and sale of the Notes is expected to occur on March 2, 2016, subject to customary closing conditions.

The Notes are being offered and sold pursuant to an automatic shelf registration statement the Company filed with the Securities and Exchange Commission that became effective upon filing on February 19, 2016 (Registration No. 333- 209612).

The description above is a summary and is qualified in its entirety by reference to the Underwriting Agreement, a copy of which is filed as an Exhibit to this Form 8-K and is incorporated herein by reference.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

Exhibit Index