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.