Antoni Leszczewicz

Antoni Leszczewicz (; 30 September 1890 – 18 February 1943) was a Polish-Lithuanian Marian Father and Roman Catholic priest. One of the 108 Martyrs of World War II, he was a missionary in China for two decades in the interwar period, later joining the Congregation of Marian Fathers of the Immaculate Conception before being burnt to death in 1943.

Leszczewicz was born on 30 September 1890 in Abramaǔščyna 1 to Jan and Karolina Leszczewicz . He was educated at a gymnasium in Saint Petersburg, and later studied at a secondary school attached to the Church of St. Catherine. In 1909, he entered the seminary of the Roman Catholic Archdiocese of Mohilev, located in Saint Petersburg. There, he was ordained to the diaconate and was later sent to the Saint Petersburg Roman Catholic Theological Academy for specialized studies. He was ordained a priest on 13 April 1914, either by Wincenty Kluczyński or by Jan Cieplak.

After his ordination, Leszczewicz served as a vicar in Irkutsk for one year,