Mizuho Bank, Ltd. (株式会社みずほ銀行, Kabushiki-gaisha Mizuho Ginkō) is the integrated retail and corporate banking unit of Mizuho Financial Group (TYO: 8411; NYSE: MFG), the third largest financial services company in Japan with total assets of approximately $1.8 trillion in 2017.

Mizuho Bank provides financial products and services to a wide range of clients, including individuals, small and medium-sized enterprises, large corporations, financial institutions and public sector entities.

Its headquarters office building is located in the Otemachi district of Chiyoda, Tokyo.

The name "Mizuho" is an archaic Japanese term meaning "golden ears of rice," and was used in the classical text Nihon Shoki to describe Japan.

Mizuho services include current accounts, domestic and international cash cards, international money transfers, credit cards, saving accounts, loans, and Internet banking.