Helderberg Nature Reserve, Nature reserve on Helderberg Mountain slopes in Somerset West, South Africa.

Helderberg Nature Reserve is a 398-hectare reserve on the southern slopes of the Helderberg mountains in Somerset West. Most of it is Kogelberg Sandstone Fynbos, with smaller patches of Boland Granite Fynbos and Southern Afrotemperate Forest. About 600 plant species have been recorded, among them pincushion proteas, cone bushes, sugar bushes, heaths and the waboom tree (Protea nitida).

Helderberg Nature Reserve was established in 1964 on the land of a former farm near Somerset West. It is a private reserve, managed by CapeNature and looked after by a non-profit organisation, the Friends of Helderberg Nature Reserve.

The reserve takes its name from the Helderberg, the mountain whose southern slopes it protects; the name is Dutch and Afrikaans for "clear mountain". The reserve is run by CapeNature together with a non-profit group, the Friends of the Helderberg Nature Reserve, who help with upkeep and visitor activities.

The walking paths are color-coded for different difficulty levels, allowing visitors to choose routes suited to their fitness and interests. Early morning or late afternoon walks are preferable, especially during warmer months, as the sun exposure on mountain slopes can be intense.

The reserve's plant list runs to about 600 recorded species, among them the waboom tree (Protea nitida), whose hard wood was once used for wagon wheels. Birdwatchers have recorded over 170 species here, and the angulate and padloper tortoises are often seen on the slopes.