Lake Oscawana is a lake at the heart of Putnam Valley, New York
State, United States
. The 386-acre (1.6 km2) lake has a depth that ranges from 25 feet (7.6 m) to 30 feet (9.1 m). The lake is fed by a stream from its north end and it drains through a stream at the middle of its eastern shore. It is nestled in between two hill ranges, which provide spectacular views if you climb one.