William Henry Weston Jr. (1890–1978) was an American botanist, mycologist, and first president of the Mycological Society of America.

One of several important papers from this period was his discovery of a new mechanism for dispersal by Sclerospora graminicola, involving explosive nocturnal discharge of spores.

Other areas of study included wild forage grasses and coconut in Florida, sugarcane mosaic diseases in Cuba, and the fungi of Barro Colorado Island in Panama.

Throughout his career, he championed an approach to the study of fungi that emphasized their biology, examining their life cycles, sexuality, morphogenesis, and discharge mechanisms.

[3] In 1979, the Mycological Society of America established the William H. Weston Award for Excellence in Teaching in his honor.