Gyo Obata was an American architect, the son of painter Chiura Obata and his wife, Haruko Obata, a floral designer. In 1955, he co-founded the global architectural firm HOK. He lived in St. Louis, Missouri, and still worked in HOK's St. Louis office. He designed several notable buildings, including the McDonnell Planetarium and GROW Pavilion at the Saint Louis Science Center, the Independence Temple of the Community of Christ church, the National Air and Space Museum in Washington, D.C., and the Abraham Lincoln Presidential Library and Museum in Springfield, Illinois.

HOK, formerly Hellmuth, Obata + Kassabaum and legally HOK Group, Inc., is an American design, architecture, engineering, and urban planning firm, founded in 1955.