Konstanty Kazimierz Brzostowski (1644–1722) was a noble of the Grand Duchy of Lithuania, count of the Holy See, and papal prelate. He was Grand Secretary of Lithuania from 1671, and shortly thereafter was Grand Writer of Lithuania. He was bishop of Smoleńsk from 1685 to 1687 and bishop of Vilnius from 1687.
- Occupation
- Catholic priest, Catholic bishop, bishop
- Position held
- Clergyman Grand Secretary of Lithuania, Commendatory abbot, Polish elector, Great Scribe of Lithuania
- Citizenship
- Grand Duchy of Lithuania, Polish–Lithuanian Commonwealth
- Born
- 1644
- Died
- October 24, 1722
