St. Regis Falls is a census-designated place (CDP) in Waverly, Franklin County, New York, United States.

The falls for which the community is named are on the river at the western end of town.

According to the United States Census Bureau, the CDP has a total area of 1.29 square miles (3.35 km2), all land.

[2] New York State Route 458 passes through the community, leading west 8 miles (13 km) to Nicholville and southeast 6.5 miles (10.5 km) to Santa Clara.

The marshy area east of the village where the water meets Duane Street (Red Tavern Road) on both sides just before Trim Hill is often referred to as Alligator Alley.