Ismail Agha Shikak , also known as Simko (Kurdish: سمکۆ, Simko; 1887–1930), was a Kurdish chieftain of the Shekak tribe. He was a nationalist warlord who controlled significant land and led thousands of Kurdish rebels who defeated the Iranian army on several occasions. He also led ethnic conflicts against Assyrians and Azerbaijanis. He was later assassinated by the Iranian government in 1930.