Buttermilk Falls State Park, State park in Tompkins County, United States.

Buttermilk Falls State Park is a nature reserve in Tompkins County, New York, covering more than 800 acres of forest trails and gorge landscapes near Cayuga Lake. The main waterfall descends in multiple steps over roughly 165 feet (50 meters) of rock face, ending in a shallow basin surrounded by walking paths and picnic tables.

Robert and Laura Treman gave the original 164 acres to New York State in 1924; the park later grew to 811 acres through state acquisitions. From 1933 to 1942 a Civilian Conservation Corps camp (Company 1265, Camp 39) worked at Buttermilk Falls and the Enfield Glen reservation, building trails, bridges and other infrastructure. Robert Treman chaired the Finger Lakes State Park Commission until his death in 1937.

The name comes from the thick, frothy foam churned up by the cascade, described in 1866 as resembling buttermilk. The Cayuga name for the falls was Sto-ke, recorded in a note on the 1750 journey of Cammerhoff and Zeisberger. A semi-natural swimming basin created by a small dam sits in the lower part of the park.

Parking areas sit at both the lower entrance near the main cascade and at the upper access point for hikers heading to longer trails. Paths along the gorge can be slippery, so sturdy footwear helps, especially after rain or during spring runoff.

The upper section of the park offers a less crowded trail winding through thick forest to the top of the gorge, revealing quiet lookout spots away from the main visitor flow. Some visitors overlook the smaller side cascades that appear along the rock walls during spring snowmelt.