Thoothukudi massacre denotes events that took place on 22 and 23 May 2018 in Thoothukudi, Tamil Nadu, India. The violence took place during an ongoing protest against proposed expansion of a copper smelter plant run by Sterlite Corporation in Thoothukudi town. Police opened fire on the protesters, killed 13 people and left 102 injured. Several policemen were also injured during the protests.