Exhibit 99.8

KPMG LLP Chartered Professional Accountants PO Box 10426 777 Dunsmuir Street Vancouver, BC    V7Y 1K3 Tel (604) 691-3000 Fax (604) 691-3031 www.kpmg.ca Consent of Independent Registered Public Accounting Firm The Board of Directors NexGen Energy Ltd. 3150 - 1021 West Hastings Street Vancouver, BC V6E 0C3 Ladies and Gentlemen: We consent to the use of our report, dated March 19, 2021, with respect to the consolidated financial statements included in this annual report on Form 40-F. We also consent to the incorporation by reference of such report in the Registration Statement (No. 333-253512) on Form F-10 of NexGen Energy Ltd. Very truly yours, Chartered Professional Accountants March 19, 2021 Vancouver, Canada KPMG LLP is a Canadian limited liability partnership and a member firm of the KPMG network of independent member firms affiliated with KPMG International Cooperative (“KPMG International”), a Swiss entity. KPMG Canada provides services to KPMG LLP.