The aim of the article is to present the idea, genesis and functions of international non-governmental organizations in the contemporary world, also an attempt to locate non-governmental organizations in joint operations and drawing some conclusions and rules basing on observations and experiences in this area. Alvin and Heidi Tofflers called non-governmental organizations “global gladiators of the 21st century”. They more often participate in joint operations in conflict regions and become natural partners for military forces in performing their military missions.