The Mizuho Bank Uchisaiwaichō Head Office Building (みずほ銀行内幸町本部ビル, Mizuho Ginkō Uchisaiwaichō Honbu Biru) was a 143 m (469 ft) tall office skyscraper in Tokyo, Japan.

[2] It contained 1.4 million sq ft (134,974 m²) of office space, 100% of which was now occupied by Mizuho Bank, the consumer banking arm of the second-largest Japanese financial conglomerate Mizuho Financial Group, while still called the DKB Head Office from time to time.

The building was built in Chiyoda at 1 Uchisaiwaichō in 1981, when it was called the Dai-Ichi Kangyo Bank Head Office Building.

It was designed by architects Yoshinobu Ashihara & Partners and developed by Shimizu Corporation, one of the “big five” real estate developers in Japan.

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