Mizuho Financial Group, Inc. abbreviated as MHFG, or simply called Mizuho is a banking holding company headquartered in the Ōtemachi district of Chiyoda, Tokyo, Japan. The name "Mizuho (瑞穂?)" literally means "abundant rice" in Japanese and "harvest" in the figurative sense.

It holds assets in excess of $1.44 trillion US dollars through its control of Mizuho Bank, Mizuho Corporate Bank, and other operating subsidiaries. The company's combined holdings form the second largest financial services group in Japan. Its banking businesses rank the third in Japan after MUFG and SMFG, and the ninth in the world by market capitalisation as of Nov 2009.1 It is the 59th largest company in the world according to Forbes Global 2000 rankings. Its shares have a primary listing on the Tokyo Stock Exchange.

Mizuho offers a range of financial services, including banking, securities, trust and Asset Management services, employing more than 68,000 people in 30 countries. It also functions as one of the main company of the keiretsu Mizuho Group, formed from the former DKB Group and the former Fuyo Group.