Hungarian forces massacred at least 150 ethnic Romanians in Ip, Transylvania, following rumors that Romanians were responsible for the deaths of two soldiers.

The events of the Ip massacre escalated in the early hours of 14 September 1940, in Ipp,, Northern Transylvania. After two Hungarian soldiers died there in an accidental explosion, rumors spread that they had been killed by Romanians. After another incident the Royal Hungarian Army, influenced by the rumor, indiscriminately massacred around 150 ethnic Romanians in the nearby locations and surrounding areas.

Ip is a commune in Sălaj County, Crișana, Romania. It is composed of five villages: Cosniciu de Jos (Alsókaznacs), Cosniciu de Sus (Felsőkaznacs), Ip, Zăuan (Szilágyzovány), and Zăuan-Băi (Zoványfürdő). The name Ip is the shortest name that a urban or rural locality bears in all of Romania, being the only name composed of only two letters.