An ivy stone or Ivy Day stone is a class memorial stone unveiled at annual Ivy Day celebrations at older colleges in the Northeastern United States.
Ivy stones are often placed on the sides of academic buildings at several American universities and colleges that are in the Ivy League or considered Little Ivies. Since 1873 at the University of Pennsylvania and since 1879 at Bates College, students have unveiled class ivy stones at the annual ivy day preceding commencement.[1][2] Princeton University also places class ivy stones on the walls of its buildings.