The Archdiocese of Białystok (Latin: Bialostocen(sis); Belarusian: Беластоцкая архідыяцэзія, romanized: Biełastockaja archidyjacezia) is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church in Podlaskie Voivodeship, Northeastern Poland.

Its cathedral archiepiscopal see is Bazylika Archikatedralna Wniebowzięcia NMP, a minor basilica in the episcopal see of Białystok.

It also has a second minor basilica : Bazylika Ofiarowania Najświętszej Marii Panny, dedicated to the Presentation of the Blessed Virgin Mary, in Różanystok.

Its Suffragan sees are : As of 2022[update], it pastorally served 352,330 Catholics (80.5% of 437,790 total; however only 43,2% are active members) on 5,550 km2 in 116 parishes and 25 missions with 390 priests (360 diocesan, 30 religious), 190 lay religious (34 brothers, 156 sisters) and 60 seminarians.

This article about a Roman Catholic diocese in Poland is a stub.