Tappan Square is a public park and National Historic Landmark[3] at the center of Oberlin, Ohio.

The park initially opened in 1885, on 13 acres (5.3 ha) of city-owned land at the bequest of Oberlin College benefactor Charles Martin Hall.

Until 1965 it held the Historic Elm, under which John Jay Shipherd and Philo Stewart were said to have knelt and prayed to God and on which spot they decided to found the town.

The site was founded by the presbyterian ministers John Jay Shipherd and Philo Stewart who declared their new community at the elm on the park's southeast corner.

The other rock, known as the "Founders Boulder", was found in Erie County and has a plaque that reads "In Memory of John J. Shipherd, Philo P. Stewart, Dedicated June 17, 1933.