| Honorific Prefix: | Blessed |
| Antoni Leszczewicz | |
| Honorific Suffix: | MIC |
| Venerated In: | Catholic Church |
| Birth Date: | 30 September 1890 |
| Birth Place: | , Russian Empire (now Belarus) |
| Death Place: | , Byelorussian SSR, Soviet Union (now Belarus) |
| Beatified Date: | 13 June 1999 |
| Beatified Place: | Warsaw |
| Beatified By: | Pope John Paul II |
| Feast Day: | 12 June |
Antoni Leszczewicz (Belarusian: Антоній Ляшчэвіч|translit=Antonij Liaščevič; 30 September 1890 – 18 February 1943) was a Polish-Belarusian Marian Father and Roman Catholic priest. He was a missionary in China for two decades in the interwar period.
He is one of the 108 Martyrs of World War II who was burned alive with a group of parishioners by the Nazis in Belarus in 1943. He was beatified by Pope John Paul II in the 1990s. [1]