Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated August 19, 2025 relating to the financial statements of Lumentum Holdings Inc. and subsidiaries (the “Company”) and the effectiveness of the Company’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of Lumentum Holdings Inc. for the year ended June 28, 2025.

 

/s/ DELOITTE & TOUCHE LLP

San Jose, California

November 19, 2025