UNITED STATES

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER PURSUANT TO RULE 13a -16 OR

15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2026

Commission File Number: 001-15002

ICICI Bank Limited
(Translation of registrant’s name into English)

ICICI Bank Towers,
Bandra-Kurla Complex
Mumbai, India 400 051
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file
annual reports under cover Form 20-F or Form 40-F.

Table of Contents

Items:

OTHER NEWS

Subject: Disclosure under Indian Listing Regulations

IBN

ICICI Bank Limited (the Bank) Report on Form 6-K

The Bank has made the below announcement to the Indian Stock Exchanges:

In continuation to our earlier letter dated August 24, 2026, please note that ICICI Bank Limited (“Bank”), acting through its IFSC Banking Unit, has today completed the issuance of USD 1 billion Senior Unsecured Fixed Rate Notes (“Notes”) under the USD 7.5 billion Global Medium Term Note Programme of the Bank. The Notes are rated BBB by S&P Global Ratings and Baa3 by Moody’s Ratings. The Notes will be listed at Global Securities Market of the India International Exchange IFSC Limited, Debt Securities Market of the NSE IFSC Limited and SGX-ST.

NOT FOR DISTRIBUTION IN THE UNITED STATES

This document is not an offer of securities for sale in the United States. Any securities referred to herein have not been and will not be registered under the United States Securities Act of 1933, as amended (the “Securities Act”) or any United States state securities laws, and may not be offered or sold in the United States except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and in accordance with any applicable United States state securities laws. There is no intention to register any securities referred to herein in the United States or to make a public offering of the securities in the United States. This document does not constitute an offer to sell or the solicitation of an offer to buy the Notes described herein.

You are requested to take note of the same and bring it to the notice of all concerned.

SIGNATURE

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 authorised.