Olha Matskiv (Ukrainian: Ольга Мацьків, Polish: Olga Maćkiw), better known by her religious name, Tarsykiya or Tarsykia (Ukrainian: Тарсикія, Polish: Tarsycja; 23 March 1919 – 17 July 1944), was a Ukrainian Greek Catholic nun and martyr. Matskiv was born in Chodorów, Second Polish Republic (now Khodoriv, Ukraine). She entered the Sisters Servants of Mary Immaculate on 3 May 1938. She took her first vows on 5 November 1940, and worked in her convent, sewing clothes for the sisters and teaching others the skill. Even before the arrival of the Soviet Army to Lviv, she took vows before her spiritu