For the month of April, 2024

Commission File Number: 001-09531

(Translation of registrant's name into English)

(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:

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

To be webcasted online

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If you have any questions, please contact Investor Relations at ir@telefonica.com or +34 914 828 700

www.telefonica.com/en/shareholders-investors/

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.