Can hazelnut be grown in India and which regions suit it?

Hazelnut is climate restricted and has no established commercial belt in India. It is a temperate crop that needs cool conditions with adequate winter chilling and mild summers, suited to higher Himalayan zones rather than the plains or warm areas. Some trial and limited planting has been explored in cooler hill regions, but there is no large proven hazelnut industry in India, so reliable variety recommendations, grafts and buyers are all scarce. Be very careful with online sellers offering hazelnut plants with high income claims. If you are in a genuinely cold hill area and curious, plant only a few as a trial under advice from a temperate horticulture research station, and do not plan your income around it. Confirm suitability for your exact altitude and climate before buying any plants.