Exhibit 15.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form F-3 (No. 333-224360) of Telefónica, S.A. of our report dated February 20, 2020 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 20‑F.

/s/ PricewaterhouseCoopers Auditores, S.L.

Madrid, Spain

February 20, 2020

PricewaterhouseCoopers Auditores, S.L., Torre PwC, Pº de la Castellana 259 B, 28046 Madrid, España

Tel.: +34 915 684 400 / +34 902 021 111, Fax: +34 915 685 400, www.pwc.es     

R. M. Madrid, hoja 87.250-1, folio 75, tomo 9.267, libro 8.054, sección 3ª

Inscrita en el R.O.A.C. con el número S0242 - CIF: B-79 031290