Simko Shikak also Ismail Agha Shikak (1887-1930), (known as Simitquh by to the Iranian historians and media, which is just a garbling of his given name, "Ismail Agha," that is further garbled by Kurdish into "Simqoh" or "Simko")) was a Kurdish chieftain of the Shakak tribe. He was born into a prominent Kurdish feudal family based in Chihriq castle located near Baranduz river in Urmia region in 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.