William Joseph Long (1866–1952) was an American writer, naturalist and minister. He lived and worked in Stamford, Connecticut as a minister of the First Congregationalist Church.
As a naturalist, he would leave Stamford every March, often with his two daughters Lois Long and Cesca, to travel to "the wilderness" of Maine. There they would stay until the first snows of October, although sometimes he would stay all winter. In the 1920s, he began spending his summers in Nova Scotia, claiming "the wilderness is getting too crowded".