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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 9, 2026 announcing the registrant's financing bond issuance.

$\"\"$

Istanbul, October 9, 2026

Announcement Regarding the Financing Bond Issuance

Within the scope of the TRY 15,000,000,000 issuance\nlimit approved by the Capital Markets Board, the book building of the financing bond issuance of our Company with a maturity date of January\n8, 2027, an annual simple interest of 37.00% with a nominal amount of TRY 500,000,000 to qualified investors within Türkiye, without\na public placement was completed, and the securities will be transferred to the investor accounts on October 9, 2026 (today).

\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

Board Decision Date	: 06.11.2025
Related Issue Limit Info
Currency Unit	: TRY
Limit	: 15,000,000,000
Issue Limit Security Type	: Debt Securities
Sale Type	: Private Placement-Sale to Qualified Investor
Domestic / Oversea	: Domestic
Capital Market Board Approval Date	: 17.06.2026

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

Capital Market Instrument to be Issued Info
Type	: Bill
Maturity Date	: 08.01.2027
Maturity (Day)	: 91
Sale Type	: Sale To Qualified Investor
Intended Nominal Amount	: 500,000,000
Intended Maximum Nominal Amount	: -
The country where the issue takes place	: Türkiye
Title Of Intermediary Brokerage House	:
Central Securities Depository	: Merkezi Kayıt Kuruluşu A.Ş.
Starting Date of Sale	: 07.10.2026
Ending Date of Sale	: 09.10.2026
Nominal Value of Capital Market Instrument Sold : 500,000,000
Maturity Starting Date	: 09.10.2026
Issue Price	: 1
Interest Rate Type	: Fixed
Interest Rate - Yearly Simple (%)	: 37.0000
Interest Rate - Yearly Compound (%)	: 42.4638
Traded in the Stock Exchange	: No
Payment Type	: TL Payment
ISIN Code	: TRFTCEL12717
Coupon Number	: 1
Currency Unit	: TRY
Coupon Payment Frequency	: Single Coupon

Redemption Plan of Capital Market Instrument Sold

\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

Coupon Number	Payment Date	Record Date*	Payment Date	Interest Rate - \n Periodic (%)	Payment \nAmount	Exchange \nRate	Was The \n Payment \n Made?
1	08.01.2027	07.01.2027	08.01.2027	9.2247
Principal/Maturity	08.01.2027	07.01.2027	08.01.2027

* The date on which the beneficiaries are determined.

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

Rating\n Company	Rating\n Note	Rating\n Date	Is\n it Investment Grade?
JCR AVRASYA DERECELENDİRME A.Ş.	(TR) J1+ Short Term (national) (TR) AAA Long Term (national)	22.05.2026	Yes

For more information:

Turkcell Investor Relations

investor.relations@turkcell.com.tr

Tel: + 90 212 313 1888

Disclaimer

This press\nrelease does not constitute an offer to sell, or a solicitation of offers to purchase or subscribe for securities in the United States\nor any other jurisdiction in which such offer or solicitation would be unlawful. The securities referred to herein have not been and will\nnot be registered under the U.S. Securities Act of 1933, as amended (the \"Securities Act\"), and may not be offered, sold or\ndelivered within the United States or to or for the benefit of, US persons (as defined in Regulation S under the Securities Act) absent\nregistration or an applicable exemption from the registration requirements of the Securities Act. This press release is being issued pursuant\nto and in accordance with Rule 135c under the Securities Act.

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 9, 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 9, 2026	By:	/s/\n Kamil Kalyon
		Name:	Kamil Kalyon
		Title:	Chief Financial Officer

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