Buffalo Harbor South Entrance Light, also known as the South Buffalo Southside Light or Buffalo South Breakwater, South Entrance Light Station, is a lighthouse at Stony Point at the entrance to Buffalo Harbor, Buffalo, New York. It was established in 1903 and deactivated in 1993. It was replaced by a nearby modern post light. The lighthouse property consists of a three-story cast iron decommissioned light tower topped with a lantern; one-story concrete fog signal building and an L-shaped concrete pier.
It was listed on the National Register of Historic Places in 2007.