The St Nedelya Church assault was a terrorist attack on St Nedelya Church in Sofia, Bulgaria. It was carried out on 16 April 1925, when a group of the Military Organisation of the Bulgarian Communist Party directed and supplied by the Soviet Military Intelligence blew up the church's roof during the funeral service of General Konstantin Georgiev, who had been killed in a previous communist assault on 14 April. 150 people, mainly from the country's political and military elite, were killed in the attack and around 500 bystander believers, who attended the liturgy, were injured.

Saint Nedelya Cathedral, is an Eastern Orthodox cathedral in Sofia, the capital of Bulgaria, a cathedral of the Sofia bishopric of the Bulgarian Patriarchate. The temple of Sveta Nedelya dates back to the 10th century, being a cathedral of the city from the 18th century. The sacred building has suffered destruction through the ages and has been reconstructed many times. The present building of the temple is among the landmarks of Sofia. It was designed by the famous Bulgarian architectural team Vasilyov-Tsolov. The relics of the Serbian king Stefan Uroš II Milutin are kept in the church.