| Honorific-Prefix: | Bishop |
| Jan Dekert | |
| Auxiliary bishop of Warsaw | |
| See: | Warsaw |
| Appointed: | 27 September 1858 |
| Term Start: | 16 January 1859 |
| Term End: | 19 November 1861 |
| Ordination: | 19 March 1825 |
| Consecration: | 16 January 1859 |
| Consecrated By: | Antoni Melchior Fijałkowski |
| Birth Name: | Jan Dekert |
| Birth Date: | 6 November 1786 |
| Birth Place: | Warsaw |
| Religion: | Catholic |
Jan Dekert (1786 - 1861) was a Polish Catholic priest, auxiliary Auxiliary bishop of Warsaw from 1859–1861. He was the son of mayor of Warsaw Jan Dekert.