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 June 2025

Commission File Number: 001-38072

NexGen Energy Ltd.
(Translation of registrant's name into English)

Suite 3150 - 1021 West Hastings Street,
Vancouver, BC, V6E 0C3

(Address of principal executive offices)

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 ☐      Form 40-F ☒


INCORPORATION BY REFERENCE

Exhibit 99.1 to this Report on Form 6-K is hereby incorporated by reference as Exhibits to the Registration Statement on Form F-10 of NexGen Energy Ltd. (File No. 333.266575).

SUBMITTED HEREWITH

Exhibits

Exhibit Description
  
99.1   News Release dated June 12, 2025


SIGNATURES

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.

  NEXGEN ENERGY LTD.
  (Registrant)
   
Date: June 12, 2025 By: /s/ Benjamin Salter
    Benjamin Salter
  Title: Chief Financial Officer



ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

EXHIBIT 99.1