Warder Clyde Allee (June 5, 1885 – March 18, 1955) was an American zoologist and ecologist who taught animal ecology. He is best known for his research on animal behavior, protocooperation, and for identifying the Allee effect. Allee was a student of Victor Shelford whose efforts led to the establishment of the Nature Conservancy. He was married to author Marjorie Hill Allee.
Allee was born in Bloomingdale, Indiana. He received the S.B. degree from Earlham College in 1908, and the S.M. and Ph.D. degrees from the University of Chicago in 1910 and 1912. Allee worked as an Assistant Professor in Zoology from 1910 to 1912. Between 1912 and 1921 he taught at the University of Illinois, Williams College, University of Oklahoma, Lake Forest College, and the Marine Biological Laboratory at Woods Hole, Massachusetts. He returned to the University of Chicago in 1921 as an Assistant Professor of Zoology and was promoted to Professor in 1928. In addition, he served as Dean in the College of Arts, Literature, and Science (1924–1926) and Secretary of the Department of Zoology (1927–1934). After retirement in 1950, he worked at the University of Florida at Gainesville, where he was Head Professor of Biology until his death in March 1955.