Estonian Safety Investigation Bureau (ESIB; or OJK) is the transport safety agency of Estonia, headquartered in Tallinn. It is under the Ministry of Economic Affairs and Communications. It investigates aviation, maritime, and rail accidents.
It was established on 1 January 2012 by the merger of several accident investigation units.
Previously aviation accidents were investigated by the ministry's Aircraft Accident Investigation Commission (lennuõnnetuse põhjuste uurimiskomisjoni).