Tokyo Watanabe Bank (東京渡辺銀行, Tōkyō Watanabe Ginkō), originally named the Twenty-Seventh National Bank (第二十七国立銀行, Dai-Nijūshichi Kokuritsu Ginkō), was a commercial bank based in Tokyo, Japan.
It was founded in 1877 and managed by Watanabe Jiemon IX, who ranked as the fifth wealthiest landlord in Tokyo City during the first decade of the 20th century.[1][2][3] Upon his death in 1909, his son Genjiro took over presidency and renamed himself Watanabe Jiemon X.[2]