Mellekh (Nepali: मेल्लेख ) is a Gaupalika (Nepali: गाउपालिका ; gaupalika) in Achham District in the Sudurpashchim Province of far-western Nepal. Mellekh has a population of 24670. The land area is 134.78 km.

At the time of the 2011 Nepal census, Mellekh Rural Municipality had a population of 24,728. Of these, 94.4% spoke Achhami, 5.4% Nepali and 0.1% other languages as their first language.

In terms of ethnicity/caste, 72.2% were Chhetri, 14.0% other Dalit, 5.2% Kami, 2.8% Sarki, 1.8% Thakuri, 1.7% Hill Brahmin, 1.7% Damai/Dholi, 0.2% Badi, 0.2% Newar and 0.1% others.

In terms of religion, 99.9% were Hindu.

In terms of literacy, 57.5% could read and write, 4.4% could only read and 38.1% could neither read nor write.