Ethnic riots mostly targeting the minority Sri Lankan Tamils broke out in Ceylon, resulting in at least 158 deaths over the next few days.

The 1958 anti-Tamil pogrom and riots in Ceylon, also known as the 58 riots, refer to the first island-wide ethnic riots and pogrom to target the minority Tamils in the Dominion of Ceylon after it became an independent dominion from Britain in 1948. The riots lasted from 22 May until 29 May 1958 although sporadic disturbances happened even after the declaration of emergency on 27 May 1958. The estimates of the murders range, based on recovered bodies, from 158 to 1,500. Although most of the victims were Tamils, Sinhalese and their property were also affected by retaliatory attacks by Tamil mobs throughout the Batticaloa and Jaffna districts. As the first full-scale race riot in the country in over forty years, the events of 1958 shattered the trust the communities had in one another and led to further polarisation.

Sri Lankan Tamils, also known as Ceylon Tamils or Eelam Tamils, are Tamils native to the South Asian island state of Sri Lanka. Today, they constitute a majority in the Northern Province, form the plurality in the Eastern Province and are in the minority throughout the rest of the country. 70% of Sri Lankan Tamils in Sri Lanka live in the Northern and Eastern provinces.

Ceylon was an independent country in the Commonwealth of Nations from 1948 to 1972, that shared a monarch with other dominions of the Commonwealth. In 1948, the British Colony of Ceylon was granted independence as Ceylon. In 1972, the country became a republic within the Commonwealth, and its name was changed to Sri Lanka.