* Flash flood in Capital of Riau Islands Anambas, two people were killed.
January 16 – Jakarta's Maritiem Museum in North Jakarta caught fire, workers and visitors in the museum were evacuated. No casualties.
January 17 – Indonesian President Jokowi reshuffles cabinet.
January 23
* A Magnitude 6.0 earthquake struck the southern coast of Java. The epicenter of the quake was near Lebak, Banten at depth of about 60 km. Two people died of heart attacks and 32 were injured. Hundreds of buildings including dozens in the capital Jakarta were damaged.
* The Argo Parahyangan executive train traveling from Jakarta jumped the railway track as it entered Bandung station. No fatalities or injured in incident.
February
February 10 – At least 27 people have died after a bus plunged from a hill on West Java. 18 other people were injured.
February 22 – At least nine people have been killed and 13 are still missing after a landslide cascaded down the terraced slopes of a rice field on Brebes, Central Java.
* Three churches across Surabaya were attacked by suicide bombers. A total of 18 people were killed in the blasts and dozens more were wounded in the attack. The perpetrators were identified as a family from Surabaya.
* On the evening, a bomb exploded inside an apartment complex near Surabaya, killing 3 people and wounded 3 others. The victims were terrorists and the blast was deemed as accidental. They planned to detonate the bomb the next day in churches.
* On the morning of May 14, the Surabaya Police Headquarters was attacked by a family of suicide bombers. They detonated the bombs while they were being stopped by policemen. 10 people were wounded in the attack.
June
June 18 - An overloaded ferry carrying 188 people and 50 vehicles capsized in Lake Toba, North Sumatra. 21 people survived the disaster while 3 people were confirmed dead. More than 160 people were missing and presumed dead. It remains as one of the deadliest ferry disaster in Indonesian history.
July
July 29 - A magnitude 6.4 earthquake struck the Indonesian island of Lombok, killing 20 people and injuring dozens. Hundreds of hikers were trapped in Mount Rinjani after multiple landslides and rockfalls occurred after the quake.
August 5 - A major 6.9 earthquake struck the island of Lombok. Widespread destruction were reported across multiple regencies in Lombok and Bali. At least 560 deaths and a total damage of 8.8 trillion rupiah were reported, making it one of strongest, deadliest, and most destructive earthquake to have ever hit Lombok.
August 18 to September 2 - 2018 Asian Games was held in Jakarta and Palembang.
September
September 28- 2018 Sulawesi earthquake and tsunami - A powerful magnitude 7.4 supershear earthquake struck the Indonesian province of Central Sulawesi, producing tsunami waves reaching as high as 13 meters and causing widespread destruction in cities and regencies in Central Sulawesi. Landslides, rockfalls, tsunamis, and major soil liquefactions, which caused hundreds of deaths in the provincial capital Palu, were reported across the province. More than 4,000 people were killed in the disaster in what was described as Central Sulawesi's deadliest disaster in Indonesian history.
October
October 13 – At least 22 people have died and many are missing after heavy floods and landslides in Sumatera, Indonesia.
October 29 – Lion Air Flight 610 crashes off the coast of Java, with 189 passengers on board
December
December 22 – More than 420 people were killed after a tsunami struck the Indonesian province of Banten and Lampung. The tsunami was caused by the collapse of the Anak Krakatoa volcano following eruptions that had happened for days prior to the disaster.
December 24 - Province of Bali becomes the first province in Indonesia to ban single-use plastics.
December 31 - At least 18 people was killed following a landslide in Sukabumi Regency, West Java.
