| Conventional Long Name: | Białystok Department |
| Common Name: | Białystok |
| Subdivision: | Department |
| Nation: | Kingdom of Prussia |
| Year Start: | 1795 |
| Year End: | 1807 |
| Date End: | 9 July |
| P1: | Podlaskie Voivodeship (1513–1795) |
| S1: | Belostok Oblast |
| Flag S1: | Flag of Russia.svg |
| S2: | Łomża Department |
| Capital: | Białystok |
| Today: | Poland Lithuania Belarus¹ |
| Footnotes: | ¹ Sopoćkinie area |
The Białystok Department (de|Kammerdepartement Bialystok, pl|Departament białostocki) was part of the New East Prussia Province of the Kingdom of Prussia from 1795 to 1807. It was created out of territory annexed in the Third Partition of Poland and included parts of Podlaskie.
The Białystok Department encompassed territory between East Prussia and the Bug River and Neman river.