Marjory Stoneman Douglas (April 7, 1890-May 14, 1998) was an American journalist, writer, feminist, and environmentalist.

She was best known for her staunch defense of the Everglades against efforts to drain it and reclaim land for development. Moving to Miami as a young woman to work for The Miami Herald, Douglas became a freelance writer, producing over a hundred short stories that were published in popular magazines.

Her most influential work was the book, The Everglades: River of Grass, which redefined the popular conception of the Everglades as a treasured river, instead of a worthless swamp; its impact has been compared to that of Rachel Carson's influential book Silent Spring.