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 April 2024

Commission File Number: 001-15092

TURKCELL ILETISIM HIZMETLERI A.S.

(Translation of registrant’s name into English)

Aydınevler Mahallesi İnönü Caddesi No:20

Küçükyalı Ofispark

34854 Maltepe
Istanbul, Turkey

(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:

x Form 20-F  ¨ Form 40-F

Enclosure: A press release dated April 4, 2024, announcing that the registrant's Board of Directors has decided to appoint Güney Bağımsız Denetim ve SMMM A.Ş. as the independent audit firm.

Istanbul, April 4, 2024

Announcement Regarding the Independent Auditor Appointment

Our Company's Board of Directors has decided to appoint Güney Bağımsız Denetim ve SMMM A.Ş. as the independent audit firm to audit our Company's accounts and operations for the year 2024 in accordance with Capital Markets Law, the Turkish Commercial Code, and related legislations and to submit this decision to the approval of our shareholders during the next Annual General Assembly Meeting of our Company.

For more information:

Turkcell Investor Relations

investor.relations@turkcell.com.tr

Tel: + 90 212 313 1888

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Turkcell Iletisim Hizmetleri A.S. has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.