The Tokaimura nuclear accidents refer to two nuclear related incidents near the village of Tōkai, Ibaraki Prefecture, Japan. The first accident occurred on 11 March 1997, producing an explosion after an experimental batch of solidified nuclear waste caught fire at the Power Reactor and Nuclear Fuel Development Corporation (PNC) radioactive waste bituminisation facility. Over twenty people were exposed to radiation.

Tōkai is a village located in Ibaraki Prefecture, Japan. As of 1 July 2020, the village had an estimated population of 37,651 in 15,148 households and a population density of 991 persons per km2. The percentage of the population aged over 65 was 25.8%. The total area of the village is 38.0 square kilometres (14.7 sq mi). The Japan Atomic Energy Agency along with other organizations currently operate a number of nuclear technology research facilities in the town. In particular, Tōkai Nuclear Power Plant is located in Tōkai.