This paper focuses on both Masaryk's theoretical concepts and practical endeavours to establish independent democratic sates in Central Europe after World War I. Masaryk's ideas developed from his theoretical knowledge, his knowledge of history, as well as from his political experience as a parliamentary deputy. At the centre lay his belief that the existence of nations as multilayered, integrated entities was an important condition for the development of democracy, provided that smaller nations were respected by larger ones and would be given sufficient space and autonomy to develop properly. The general acceptance of democratic and humanitarian values and principles would guarantee an end to the traditional expansionism of larger nations at the expense of the freedom, standards and dignity of smaller nations. Attention is also focused on Masaryk's extensive activities during the First World War regarding the independence of democratic states in Central Europe.