Coldwater Stream Campsite is a free, basic DOC-managed campsite situated in the Rainbow Conservation Area along the upper Wairau River, in the Nelson/Tasman region of New Zealand's South Island.

It sits on an old stock route, giving it a notably remote and isolated character.

Access is via the Wairau–Hanmer Springs Hydro Road (Rainbow Road), a gravel route with stream fords that requires a high-clearance 4WD vehicle, or can be reached by mountain bike or on foot.

Facilities are minimal — basic toilets and water sourced from the stream — so visitors must be fully self-sufficient.

The campsite serves as a popular base for 4WD exploration and mountain biking, with trout fishing and kayaking on the river offering quieter alternatives. Note that road access fees apply, and this location is distinct from the nearby Coldwater Hut.