Mohammad-Reza Kolahi (Persian: محمدرضا کلاهی) (1958–15 December 2015) was a member of the People's Mujahedin of Iran (MEK) who, according to Iranian authorities, was suspected of planting a bomb at the headquarters of the Islamic Republican Party (IRP) that killed more than 70 officials on 28 June 1981.

[2] On 28 June 1981, two bombs were detonated at the IRP headquarters in Tehran, killing Chief Justice Mohammad Beheshti and some seventy Iranian officials.

According to the Islamic Republic of Iran, Kolahi was suspected of planting the bombs as he left the building to "buy ice creams" ten minutes before the detonations.

[6] According to Ervand Abrahamian, "whatever the truth, the Islamic Republic used the incident to wage war on the Left opposition in general and the Mojahedin in particular.

"[7] In 2018, it was revealed that Kolahi had been living in the Netherlands as a refugee under the false identity of Ali Motamed (Persian: علی معتمد) and had been murdered in December 2015.