Varanasi South is a constituency of the Uttar Pradesh Legislative Assembly covering the city of Varanasi South in the Varanasi district of Uttar Pradesh, India.

The constituency has a preponderance of voters belonging to Kayastha and Brahmin caste.

The Bengali stand second only to the twin caste of Kayastha-Brahmin in population, in this constituency.

Bharatiya Janta Party candidate Dr. Neelkanth Tiwari won in 2022 Uttar Pradesh Legislative Elections defeating Samajvadi Party candidate Kameshwar Nath Dixit alias Kishan by a margin of 10,722 votes.

Bharatiya Janta Party candidate Dr. Neelkanth Tiwari won in 2017 Uttar Pradesh Legislative Elections defeating Indian National Congress candidate Rajesh Mishra by a margin of 17,226 votes.