The Archdiocese of Poznań (Latin: Posnanien(sis)) is one of 14 archdioceses located in Poland, with the seat located in Poznań.
968: Established as Missionary Diocese of Poland with seat in Poznań subordinated directly to the Holy See
1000: Transformed to Diocese of Poznań subordinated directly to the Holy See
11th–12th century: Subordination of Diocese of Poznań to Metropolitan Archdiocese of Gniezno as suffragan diocese
16 July 1821: Raised to status of Metropolitan Archdiocese and joined with Archdiocese of Gniezno in personal union in aeque principaliter.
12 November 1948: dissolution of union between Archdioceses of Poznań and Gniezno as Primate of Poland Cardinal August Hlond appointed ordinary of the Archdioceses of Warsaw and Gniezno.
Archcathedral Basilica of St. Peter and St. Paul, Poznań
Bazylika Niepokalanego Poczęcia NMP kk. Filipinów, Gostyń (Święta Góra)
Archbishop's Theological Seminary
Society of Christ Major Seminary