Leetonia is an unincorporated community in Elk Township, Tioga County, in the U.S. state of Pennsylvania.

Wagons hauled lumber and tanned leather to the Cedar Run station on the New York Central Railroad line through the Pine Creek Gorge.

[4] The Central Pennsylvania Lumber Company bought the land, tannery, and an existing hemlock sawmill in 1903.

[4] Between 1933 and 1941, Leetonia was the site of Civilian Conservation Corps (CCC) Camp S-90-Pa. After arriving at the camp site, Company 328, consisting of 193 men, built barracks and worked on forest conservation, trail making, wildlife protection, and construction of state parks.

After a flood on the West Branch Susquehanna River in 1936, the men were sent to the nearby city of Williamsport, where for 19 days they cleaned and disinfected flood-damaged buildings.