The Tjaynera Falls is a waterfall on the Sandy Creek that is located within the Litchfield National Park in the Northern Territory of Australia.

The waterfall descends from an elevation of 103 metres (338 ft) above sea level in one drop that ranges in height between 35–48 metres (115–157 ft). Accessible by four-wheel drive trail, the falls are in the western portion of the park, 90 kilometres (56 mi) south of Darwin.