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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 October 2026

Commission File Number: 001-15092

TURKCELL İLETİŞİM HİZMETLERİ\nA.Ş.

(Translation of registrant’s name into English)

Turkcell Küçükyalı Plaza

Aydınevler Mahallesi, İsmet\n İnönü Caddesi, No:20

Küçükyalı\nB Blok Ofispark

34854 Maltepe
\nIstanbul, Türkiye

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual\nreports under cover of Form 20-F or Form 40-F:

x Form 20-F  ¨ \nForm 40-F

Enclosure: A press release dated October 27, 2026 announcing the registrant’s share buy-back transactions.

$\"\"$

Istanbul, October 27, 2026

Announcement Regarding the Share Buy-back Transactions

Within the scope of our Company’s buy-back\nprogram, with the aim of protecting the interests of our stakeholders and supporting healthy price formation in the market while maintaining\nthe fair value of our shares, on October 27, 2026, a total of 1,196,377 shares were purchased at an average price level of TRY 90.50.\nThe total transaction value is TRY 108,273,261.

The details of the buy-back transactions

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

Code of Share Subject to \nBuy-back	Transaction Date	Nominal Value of \nShares Subject to \nTransaction (TRY)	Ratio to Capital \n(%)	Transaction Price \n(TRY / Unit)	Nominal Value Of \nShares Previously \nBuy-Backed Within \nThe Frame Of The \nProgram (TRY)	Privileges. If Any, \nAssociated with \nThese Shares
Group B, TCELL, TRATCELL91M1	12.11.2025	2,093,944	0.095	95.58	-	-
Group B, TCELL, TRATCELL91M1	23.10.2026	3,201,696	0.146	86.75	2,093,944	-
Group B, TCELL, TRATCELL91M1	27.10.2026	1,196,377	0.054	90.50	5,295,640	-

For more information:

Turkcell Investor Relations
\ninvestor.relations@turkcell.com.tr
\nTel: + 90 212 313 1888

SIGNATURES

Pursuant to the requirements\nof the Securities Exchange Act of 1934, Turkcell İletişim Hizmetleri A.Ş. has duly caused this report to be signed on its behalf by the\nundersigned, thereunto duly authorized.

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.

Date: October 27, 2026	By:	/s/\n Özlem Yardım
		Name:	Özlem\n Yardım
		Title:	Investor Relations Corporate\n Finance Director

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.

Date: October 27, 2026	By:	/s/\n Kamil Kalyon
		Name:	Kamil Kalyon
		Title:	Chief Financial Officer

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