The Liberation Tigers of Tamil Eelam was a Tamil militant organization that was based in northeastern Sri Lanka. Its aim was to secure an independent state of Tamil Eelam in the north and east in response to the state policies of successive Sri Lankan governments that were widely considered to be discriminatory towards the minority Sri Lankan Tamils, as well as the oppressive actions—including anti-Tamil pogroms in 1956 and 1958—carried out by the majority Sinhalese. Initially starting out as a guerrilla force, the LTTE increasingly came to resemble that of a conventional fighting force with a well-developed military wing that included a navy, an airborne unit, an intelligence wing, and a specialised suicide attack unit. In particular, India's relationship with the LTTE was complex, as it went from initially supporting the organisation to engaging it in direct combat through the Indian Peace Keeping Force (IPKF), owing to changes in the former's foreign policy during the phase of the conflict. The LTTE gained global notoriety for using women and children in combat and carrying out a number of high-profile assassinations, including former Indian Prime Minister Rajiv Gandhi in 1991 and Sri Lankan President Ranasinghe Premadasa in 1993.

Over the course of the conflict, the LTTE frequently exchanged control of territory in the north-east with the Sri Lankan military, with the two sides engaging in intense military confrontations. It was involved in four unsuccessful rounds of peace talks with the Sri Lankan government and at its peak in 2000, the LTTE was in control of 76% of the landmass in the Northern and Eastern provinces of Sri Lanka. Prabhakaran headed the organisation from its inception until his death in 2009. Between 1983 and 2009, more than 80,000 were killed in the civil war, of which many were Sri Lankan Tamils. 800,000 Sri Lankan Tamils also left Sri Lanka for various destinations, including Europe, North America, and Asia.