Sattanatha Muthiah Ganapathi, popularly known as S. M. Ganapathi sthapathi, (26 April 1931 – 7 April 2017) was an Indian architect and builder (sthapati) of traditional Hindu temple architecture. He was known for his contribution in saving 48 archaeologically important temples near the Nagarjun Sagar reservoir from submergence. Orirukkai Manimantapam, Ramalayam and Kalyana Mandapam at Bhadrachalam and the Mahamantapam of the Badrinath Temple are some of his notable creations. The Government of India awarded him the fourth highest civilian award of Padma Shri in 1990.