| Brunswick River | |
| Name Other: | Middle Arm of Brunswick River Main Arm of Brunswick River |
| Name Etymology: | In honour of Queen Caroline of Brunswick |
| Map Size: | 250 |
| Pushpin Map: | Australia New South Wales |
| Pushpin Map Size: | 250 |
| Pushpin Map Caption: | Location of the Brunswick River mouth in New South Wales |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | State |
| Subdivision Name2: | New South Wales |
| Subdivision Type3: | IBRA |
| Subdivision Name3: | NSW North Coast |
| Subdivision Type4: | District |
| Subdivision Name4: | Northern Rivers |
| Subdivision Type5: | LGA |
| Subdivision Name5: | Byron |
| Length: | 34km (21miles) |
| Source1: | Mount Jerusalem |
| Source1 Location: | Palmwoods, near Uki |
| Source1 Elevation: | 141m (463feet) |
| Mouth: | Coral Sea, South Pacific Ocean |
| Mouth Location: | Brunswick Heads |
| Mouth Coordinates: | -28.5375°N 153.5583°W |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 226.3km2 |
| Tributaries Right: | Mullumbimby Creek, Kings Creek (New South Wales), Simpsons Creek |
| Custom Label: | National park |
| Custom Data: | Mount Jerusalem NP |
| Extra: | [1] |
Brunswick River is an open mature wave dominated barrier estuary,[2] located in the Northern Rivers region of New South Wales, Australia.
Brunswick River rises on the eastern slopes of Mount Jerusalem, at Palmwoods, near Uki, and flows generally east southeast, before reaching its mouth at the Coral Sea of the South Pacific Ocean, at Brunswick Heads. The river descends over its course;[1] through the towns of Mullumbimby and Brunswick Heads.
Brunswick River is impounded by a lake at Tyagarah, where the local tea trees give the lake water a brown tint. This lake becomes a popular swimming hole in the summer months and is used by naturists who come down from Tyagrah Beach. The naturist area is only about north of Byron Bay.
The north arm of the river, called Marshalls Creek, flows through Ocean Shores, Billinudgel, Ocean Shores North and The Pocket. Marshalls Creek also connects to a canal in Ocean Shores North and South Golden Beach. The south arm of the river, called Simpsons Creek, flows through Brunswick Heads, Bayside and Tyagarah.
Between Brunswick Heads and Ocean Shores, the Pacific Highway crosses the river.
The northern bank at the mouth of the river is the northern extent of the Cape Byron Marine Park.[3]