The Wasielewski family is a German noble family of Polish extraction. Members of the family held significant military positions in the Kingdom of Prussia and later within the German Empire.
The Wasielewski family is Catholic and Protestant aristocracy, that commenced with Nicolaus Wasielewski recorded by King Sigismund I. of Poland in 1531. The Prussian line of the family begins with Thaddäus v. Wasielewski (1739–1803) with legitimation as Knights on 26 November 1789.
The family coat of arms "ROGALA" shows two horns, a buck horn and a buffalo horn. Both horns are standing upright. The buck horn has from 3 to 6 ends. The buffalo horn also described as a Bull or Wisent horn, is closed or open with a mouthpiece as a war or hunting horn. The horns are upright in a split shield. The family colours are red and white.