Rokuro Ishikawa, D.Eng (石川 六郎, Ishikawa Rokurō, 5 November 1925 – 14 December 2005) was a Japanese businessman and one of the most influential figures in the Japanese construction industry. He was Honorary Chairman of Kajima Corporation, one of the biggest construction companies in Japan, from 2005 until his death. Prior to that, he was President and Chairman of Kajima Corporation. He was married to Yoshiko (née Kajima), a daughter of the fourth president and the founding family of Kajima, Morinoske Kajima. His father was Ichiro Ishikawa, the first Chairman of the Japan Business Federation.