Petr Chelčický was a Czech Christian spiritual leader and author in the 15th century Bohemia, now the Czech Republic. He was one of the most influential thinkers of the Bohemian Reformation. Petr Chelčický inspired the Unitas Fratrum, who opposed transubstantiation and monasticism, insisting on pacifism and the primacy of scripture. There are multiple parallels with the teachings of the Anabaptists and Petr Chelčický. Czech Baptists have also expressed continuity with the Bohemian reformation by identifying with Petr Chelčický.

Jan Hus, sometimes anglicized as John Hus or John Huss, and referred to in historical texts as Iohannes Hus or Johannes Huss, was a Czech theologian and philosopher who became a Church reformer and the inspiration of Hussitism, a key predecessor to Protestantism, and a seminal figure in the Bohemian Reformation. Hus is considered to be the first Church reformer, even though some designate the theorist John Wycliffe. His teachings had a strong influence, most immediately in the approval of a reformed Bohemian religious denomination and, over a century later, on Martin Luther.