Edmund Ezra Day (December 7, 1883 – March 23, 1951) was an American educator.
Day received his undergraduate and master's degrees from Dartmouth College and his doctorate in economics from Harvard. While at Dartmouth, be became a brother of Theta Delta Chi. In 1923 he went to the University of Michigan, where he served as professor of economics, organizer and first dean of the School of Business Administration, and Dean of the University. He went on to serve as the fifth president of Cornell University from 1937 to 1949. While in office, he helped establish the School of Industrial and Labor Relations at Cornell.
The administrative building at Cornell, Day Hall, is named after Edmund Ezra Day. He was interred in Sage Chapel on Cornell's campus.