List of terrorist incidents, 1998
The following is a timeline of acts and failed attempts that can be considered non-state terrorism in 1998.
- India, January: Wandhama Massacre - 24 Kashmiri Pandits are massacred by Kashmiri militants in the city of Wandhama in Indian-controlled Kashmir.
- Algeria, January 11: Sidi-Hamed massacre Between 120 and 400 people are killed when the Armed Islamic Group bombs a mosque in Haouche Sahraoui and opens fire on civilians in a cinema in Sidi Ahmen. 
- India, February 14: 1998 Coimbatore bombings - Bombings by suspected Islamic Jihadi groups on an election rally in the city of Coimbatore kill about 60 people.
- Sri Lanka, January 25: LTTE bombs the sacred Buddhist shrine Temple of the Tooth in Kandy, killing 17.
- United States, January 29: The anti-abortion Army of God bombs a health clinic in Birmingham, Alabama, killing a police officer and injuring a worker at the clinic.
- Latvia, Russia, April 2/April 6: Two bombs explode in Riga targeting a Synagogue and the Russian Embassy building; the attacks are linked to Fascist extremist movements. See also Riga Bombing 1998.
- Russia, May 13: A bomb blast destroys the outer wall of the Marina Roscha Synagogue in Moscow. The third time the building has been attacked.
- Colombia, August 5: Rebel groups ELN and FARC attack police and army bases, a major dam, oil pipelines and other targets in 17 of the 32 departments, killing at least 26 police officers.
- Tanzania, Kenya United States, August 7: U.S. embassy bombings in Dar es Salaam and Nairobi, killing 225 people and injuring more than 4,000, by al-Qaeda, see FBI Most Wanted Terrorists
- Northern Ireland, August 15: Omagh bombing by the Real IRA (an IRA splinter group) kills 29.
- Colombia, October 18: The rebel group ELN blows the Ocensa pipeline near Machuca, Antioquia. The resulting fire kills 84 civilians, most of them burned alive, and injures at least 100. Initially, ELN denies responsibly but then accepts it as a "military error". The heads of ELN have been sentenced to 40 years in prison for this action. During the following years, ELN and FARC conduct over 600 attacks with explosives on pipelines in Colombia, mostly targeting the Caño Limón line, according to the Colombian Ministry of Defense