HDB 6-K

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, 2026

Commission File Number 001-15216

HDFC BANK LIMITED

(Translation of registrant’s name into English)

HDFC Bank House, Senapati Bapat Marg,

Lower Parel, Mumbai. 400 013, India

(Address of principal executive office)

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

Form 20-F ☒ Form 40-F ☐

SIGNATURES

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 authorized.

EXHIBIT INDEX

The following documents (bearing the exhibit number listed below) are furnished herewith and are made a part of this report pursuant to the General Instructions for Form 6-K.

Exhibit No. 99

Description

Disclosure

EX-99

Exhibit 99

August 24, 2026

New York Stock Exchange

11, Wall Street,

New York,

NY 10005

USA

Dear Sir,

Sub: Disclosure

This is to inform that following ESG ratings have been assigned to the Bank on August 24, 2026:

We would like to clarify that the Bank has not engaged ESG Risk Assessments & Insights Limited and Crisil ESG Ratings & Analytics Limited for any such rating or report and the same is independently prepared by them based on information available in the public domain.

This is for your information and appropriate dissemination.

Yours faithfully,

For HDFC Bank Limited

Sd/-

Ajay Agarwal

Company Secretary

Group Head – Secretarial & Group Oversight