Simko Shikak (also known as "Simitquh"; born Ismail Agha Shikak 1887 – 1930) was a Kurdish chieftain of the Shakak tribe. He was born into a prominent Kurdish feudal family based in Chihriq castle located near the Baranduz river in the Urmia region of northwestern Iran. By 1920 parts of Iranian Azerbaijan located west of Lake Urmia were under his control. He led Kurdish farmers into battle and defeated the Iranian army on several occasions. The Iranian government had him assassinated in 1930. Simko took part in the massacre of the Assyrians of Khoy and instigated the massacre of 1000 Assyrians in Salmas.
His family was one of the most prominent and politically active Kurdish families throughout Qajar reign from the late 18th to early 20th century. Sadiq Khan Shikak was one of the generals and governors in the Agha Muhammad Khan's early Qajar state and was commanding a force of 10,000 soldiers. However, he was soon fell out of favor and Qajar monarch attempted to murder him. Sadiq Khan has been accused of taking part in the assassination of Qajar king in the town of Shusha in 1797. Among other prominent members of the family are Ismail Khan The Great and his son Ali Khan, Muhammad Pasha son of Ali Khan, Cewer (Ja'afar) Agha brother of Simko. Many members of the family were murdered by the Qajar state such as Cewer(Dja'far) Agha who was killed at Tabriz by the order of governor general.
In 1905, the Qajar monarch Mozafar-al-Din Shah appointed Husein Qulikhan Nizamul-saltana as the general governor of Azerbaijan. According to Iranian historian Ahmad Kasravi, Nizamul-saltana officially invited Cewer Agha to Tabriz in order to consult him on the border issues between Iran and the Ottoman Empire. Once Cewer Agha arrived in Tabriz, Nizamul-saltana ordered Muhammad Hussein Khan Zargham to invite Cewer Agha to his own residence and murder him. Cewer Agha was accompanied by seven of his guards including one of his uncles. Muhammad Ali Mirza, the Iranian Crown Prince, ordered his murder via telegraph sent to Nizamul-saltana. Five of Cewer Agha's guards managed to escape from the murder plot in Tabriz in a ferocious battle and return to Chari castle. Cewer's father, Muhammad Agha, sought help from Sultan Abdulhamid II in Istanbul to avenge the murder of his son. However Iranian envoy in Ottoman court managed to counter his efforts and according to some sources, Muhammad Agha was assassinated in a Qajar conspiracy in Istanbul. Murder of Cewer Agha caused outrage among the Kurds. Moreover, many Iranian intellectuals and constitutionalists in Tabriz and Tehran condemned his assassination.