The Polish Brethren (Polish: Bracia Polscy) were members of the Minor Reformed Church of Poland, a Nontrinitarian Protestant church that existed in Poland from 1565 to 1658. By those on the outside, they were called "Arians" or "Socinians" (, ), but themselves preferred simply to be called "Brethren" or "Christians", and, after their expulsion from Poland, "Unitarians".
