Jan Piechowiak
Catholic priest from Poland
- Born: 1905-12-09 (Oborniki)
- Occupation: Catholic priest
- Participant in: Pohl Trial (date: 1947-03-21, 1947-08-06; role: affiant)
- Significant person: Johannes Baier (period: 1942-02-01 through 1945-04-01; role: supervisor)
- Place of detention: Dachau concentration camp (period: 1940-05-22 through 1945-04-29)
- Residence: Frankfurt am Main