Douglas Houghton Campbell (December 19, 1859 – February 24, 1953) was an American botanist and university professor. He was one of the 15 founding professors at Stanford University. His death was described as "the end of an era of a group of great plant morphologists." Douglas Campbell graduated from Detroit High School in 1878, going on to study at the University of Michigan. He studied botany, learning new microscopy techniques, and becoming interested in cryptogrammic (deciduous) ferns.
When Campbell returned to the United States he took up a professorship at Indiana University (1888 to 1891), writing the textbook Elements of Structural and Systematic Botany. In 1891 he became the founding head of the botany department at Stanford University and remained at Stanford for the remainder of his career, retiring in 1925.