An explosion at the State Central Navy Testing Range in Nyonoksa, Russia, kills five people.

The Nyonoksa radiation accident, Arkhangelsk explosion or Nyonoksa explosion occurred on 8 August 2019 near Nyonoksa, a village under the administrative jurisdiction of Severodvinsk, Arkhangelsk Oblast, Russian Federation. Five military and civilian specialists were killed and three were injured.

The State Central Navy Testing Range at Nyonoksa is the main rocket launching site of the Soviet Navy and later the Russian Navy. The site is located east from in the settlement of Sopka 2 kilometres (1.2 mi) north of the Nyonoksa.

Nyonoksa, also Nenoksa, is a rural locality under the administrative jurisdiction of Severodvinsk Town of Oblast Significance, Arkhangelsk Oblast, Russia. It is located at the coast of the Dvina Bay of the White Sea 19 miles (31 km) northwest of the city of Severodvinsk. The Nyonoksa railway station is 1.2 miles (1.9 km) from Nyonoksa at the mostly military village of Sopka along the Northern Railway line from Severodvinsk. Nyonoksa is accessible by land vehicles only during the winter months when the nearby swampland freezes.

August 8 is the 220th day of the year in the Gregorian calendar; 145 days remain until the end of the year.