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 August 2025

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, Türkiye

(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 August 13, 2025, announcing the issuance of the registrant's financing bond.

Istanbul, August 13, 2025

Announcement Regarding the Financing Bond Issuance

Within the scope of the TRY 10,000,000,000 issuance limit approved by the Capital Markets Board, the book building of the financing bond issuance of our Company with a maturity date of November 20, 2025, an annual simple interest of 41.50% with a nominal amount of TRY 1,500,000,000 to qualified investors within Türkiye, without a public placement was completed, and the securities will be transferred to the investor accounts on August 13, 2025.

Redemption Plan of Capital Market Instrument Sold

* The date on which the beneficiaries are determined.

Issuer Rating Note

For more information:

Turkcell Investor Relations

investor.relations@turkcell.com.tr

Tel: + 90 212 313 1888

Disclaimer

This press release does not constitute an offer to sell, or a solicitation of offers to purchase or subscribe for securities in the United States or any other jurisdiction in which such offer or solicitation would be unlawful. The securities referred to herein have not been and will not be registered under the U.S. Securities Act of 1933, as amended (the "Securities Act"), and may not be offered, sold or delivered within the United States or to or for the benefit of, US persons (as defined in Regulation S under the Securities Act) absent registration or an applicable exemption from the registration requirements of the Securities Act. This press release is being issued pursuant to and in accordance with Rule 135c under the Securities Act.

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.