Clyde Wiegand (May 23, 1915, Long Beach, Washington – July 5, 1996) was an American physicist.^[1]

Wiegand received his undergraduate degree from Willamette University in 1940. He began his graduate work in physics in 1941 at UC Berkeley.

He was best known for the co-discovery of the antiproton in 1955, along with Owen Chamberlain, Emilio Segrè, and Thomas Ypsilantis. He was also a large contributor to the research of the atomic bomb.

He died at his home in Oakland, California of prostate cancer, aged 81.