Wyangala Dam, Embankment dam on the Lachlan River in New South Wales, Australia

Wyangala Dam is a gated embankment and gravity dam across the Lachlan River in New South Wales, Australia. Its rock-fill wall with a clay core stands 85 metres high and 1,370 metres long, creating Lake Wyangala. The dam has eight radial gates and a concrete chute spillway.

Construction of the dam started in the late 1920s and was completed in the early 1930s, making it an early major irrigation project in New South Wales. The project represented an important step forward in the region's water management.

The name Wyangala is said to come from a Wiradjuri word of unknown meaning and was the name of Wyangala Station, a property flooded when the reservoir filled in 1935. The station homestead, first settled by the Newham family, lies below the waterline and appears only when the dam is close to dry. The small settlement of Wyangala, downstream of the wall, was built to house construction workers.

The dam area is best visited during drier months when surrounding pathways are easily accessible. Visitors should prepare for open, exposed terrain with variable weather conditions throughout the visit.

The original 1935 concrete gravity wall still stands beneath the water, visible only when the reservoir drops to about 30 per cent of capacity. The rock-fill embankment built between 1961 and 1971 was added downstream because engineers feared the old wall could lift from its base in a major flood.