| Jan Mazur | |
| Bishop of Siedlce | |
| Appointed: | 24 October 1968 |
| Ordination: | 26 June 1949 |
| Consecration: | 6 August 1961 |
| Ordained By: | Zdzisław Goliński |
| Other Post: | Auxiliary Bishop of Lublin (1961 - 1968) Titular Bishop of Bladia (1961 - 1968) |
| Birth Date: | 5 June 1920 |
| Birth Place: | Płoskie |
| Death Place: | Siedlce |
| Alma Mater: | John Paul II Catholic University of Lublin |
Jan Mazur (June 5, 1920 in Płoskie – September 26, 2008 in Siedlce) was the Polish bishop of the Roman Catholic Diocese of Siedlce from August 6, 1968, until his retirement on March 25, 1996. He remained the Bishop Emeritus of Siedlce until his death in 2008 at the age of 88.