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 in office, he helped establish the School of Industrial and Labor Relations at Cornell.

The main administrative building at Cornell was built in 1947 and named Day Hall in his honor.

[3] Day is one of only fifteen people whose remains are interred in Cornell's Sage Chapel, a list which includes founders Ezra Cornell and Andrew Dickson White, as well as "third founder" Henry W.