- The official Trophy for the 2018 FIFA World Cup was brought to Sri Lanka and was kept in Colombo for 2 days by displaying it to the public as the 2018 FIFA World Cup Trophy tour began from Sri Lanka to across 52 nations, marking the first ever instance that Sri Lanka was selected as one of the nations to officially showcase the prestigious trophy in history.
- Sri Lanka marked its 70th independence day
- Arjun Alosysius and Kasun Palisena were arrested at around 7.30 AM regarding the alleged treasury bond scam issues.
- local elections, 2018 was conducted to elect 8293 members to the 341 local authorities
- 2018 Anti-Muslim riots was occurred in Ampara town between Sinhalese and Muslim groups. Mosques, restaurants and Muslim civilians were targeted during the conflict as the alleged rumours were caused by a mob stating that chemicals have been added to the food items at a particular Muslim restaurant in the vicinity of temple junction in Ampara
- Anti-Muslim riots spread from Udispattuwa and Teldeniya to Digana and other areas in the Kandy District. Several Muslim businesses, mosques and shops were attacked by a Sinhalese mob following the death of a Buddhist male following an assault by 4 intoxicated Muslim youths on 22 February 2018. Following the violence in Kandy, the Sri Lankan government declared a State of emergency in the nation for 10 days
- Social media platforms including Facebook and phone messaging applications such as WhatsApp had been blocked
- Doyen of Sinhala cinema Dr. Lester James Peries passes away
- Floods resulted after a heavy rainfall starting from 19 May causing severe damages throughout the island with leaving 13 dead, 23 missing and about over 100, 000 affected due to torrential floods.
- The 2018 cricket pitch fixing and betting scandal has been revealed by Al Jazeera for tampering the Galle International Stadium pitch previously in a Test match against Australia in 2016 and in a match against India in 2017. The groundsman and also fellow Sri Lankan first-class cricketer Tharindu Mendis were accused and have been investigated by the International Cricket Council for attempting another Galle pitch tampering scandal prior to the start of the 1st test match against England in November 2018
- it was reported that Sri Lanka is going to reinstate Capital punishment for drug dealers, president Maithripala Sirisena told the government, which earlier had unanimously backed the reinstatement of capital punishment, that he “was ready to sign the death warrants,”
- Akalanka Peiris became the first ever Sri Lankan student to sit for a Sri Lankan GCE A/L examinations outside Sri Lanka as he was granted special permission to write A/L exams in Jakarta, Indonesia just prior to his preparations for the 2018 Asian Games
- Jana Balaya Kolambata protest rally organized by Joint Opposition took place in Colombo.
- UNP marks 72nd Anniversary
- Former President Chandrika Kumaratunga becomes the first Sri Lankan recipient to receive the French highest honour award (Commandeur de la Legion of Honour)
- Parami Wasanthi Maristela won Sri Lanka’s first ever Youth Olympics medal, a bronze in the girls’ 2000 metre steeplechase athletics event during the 2018 Summer Youth Olympics representing Sri Lanka
- Prime Minister of Sri Lanka Ranil Wickremasinghe is replaced by Mahinda Rajapakse, causing a constitutional crisis
- Maithripala Sirisena dissolves Parliament by proclamation, from midnight of 9 November and declared snap elections to be held on around 5 January 2019
- Rangana Herath retired from international cricket with 433 Test wickets as the most successful left arm spinner
- According to Matthew was released in Sri Lanka and Australia.
- Sri Lanka national deaf cricket team won their maiden Deaf T20 World Cup after emerging victorious at the 2018 Deaf T20 World Cup defeating India by 36 runs.
- President Maithripala Sirisena reinstates Mr. Ranil Wickremesinghe in the position of Prime Minister, ending the constitutional coup.
- Lucion Pushparaj became the first ever Sri Lankan to win the World Bodybuilding Championship during the 2018 World Bodybuilding Championship.
- Flash floods in Northern Province caused by heavy rains leaving one dead and more than 75000 people have been reported to be affected in five districts.
- Supreme Court Says the President Violated the Constitution by Dissolving Parliament