Kōhaihai Campsite is a Department of Conservation site nestled at the mouth of the Kōhaihai River in Kahurangi National Park, on New Zealand's West Coast.

Surrounded by lush nīkau forest, it sits at the northern end of Council Road just north of Karamea, with the final 3 km of approach on gravel. The site also marks the start of the famous Heaphy Track.

The campsite offers 50 non-powered tent sites and operates year-round. Facilities include flush toilets, barbecue areas, and untreated water. Stays are limited to a maximum of two consecutive nights.

Activities in the area include walking tracks, day hikes, and kayaking or swimming in the river lagoon upstream from the mouth.

Swimmers should note that wading or swimming at the river mouth or along the Heaphy coastline is dangerous due to strong tidal currents and rips.