Sekiguchi (written: 関口) is a Japanese surname. Notable people with the surname include: Fusao Sekiguchi Japanese industrialist Gen Sekiguchi Japanese film director Hisao Sekiguchi Japanese footballer Isamu Sekiguchi (関口 勇; born 1910), Japanese skier Kazuyuki Sekiguchi Japanese musician Kunimitsu Sekiguchi Japanese footballer Mai Sekiguchi Japanese actress Masakazu Sekiguchi Japanese politician Taro Sekiguchi Japanese motorcycle racer Yuhi Sekiguchi Japanese race driver The Sekiguchi Corporation