Shoji Sadao (贞夫翔二, December 20, 1926 – November 2, 2019) was a Japanese American architect. He was best known for his work with R. Buckminster Fuller and Isamu Noguchi. During World War II he was stationed in Germany and was a cartographer for the United States Army. In 1964 Sadao co-founded the architectural firm Fuller & Sadao Inc., whose first project was to design the large geodesic dome for the U.S. Pavilion at Expo 67 in Montreal. He was born in Los Angeles, California.
Sadao died on November 3, 2019 in Tokyo from heart and kidney failure, aged 92.