The Nullica River is an intermittently closed semi-mature saline coastal lagoon^[3] or perennial river,^[1] located in the South Coast region of New South Wales, Australia.

The Nullica River rises below Nullica Hill within Nullica State Forest, approximately 11 kilometres (6.8 mi) west of Eden, The river flows generally east southeast, joined by one minor tributary, before reaching its mouth and emptying into Nullica Bay, within Twofold Bay, and spilling into the Tasman Sea of the South Pacific Ocean, east of Nullica.^[1] The river descends 137 metres (449 ft) over its 11 kilometres (6.8 mi) course.^[2]

The catchment area of the river is 55 square kilometres (21 sq mi) with a volume of 176 megalitres (6.2×10^⁶ cu ft) over a surface area of 0.3 square kilometres (0.12 sq mi), at an average depth of 0.6 metres (2 ft 0 in).^[4]

West of the river's mouth, the Princes Highway crosses the Nullica River.

• List of rivers of Australia
• List of rivers of New South Wales (L–Z)
• Rivers of New South Wales