Zmicier Zhylunovich (Belarusian-lacinka: Źmicier Žyłunovič, Belarusian-Cyrillic alphabet: Зьміцер Жылуновіч, transliterated from Russian: "Dmitri Zhilunovich") (October 13, 1887 – April 11, 1937) was a Belarusian poet, writer and journalist, known under pen name Tsishka Hartny (Ciška Hartny, Цішка Гартны), and a political leader.
He was the first head of a Soviet government in Belarus, the Socialist Soviet Republic of Byelorussia.
In 1937, during the Great Purge in the Soviet Union, he was arrested as an "enemy of the Belarusian people" and committed suicide in prison.