ENGLISH SUMMARY: This thesis, called "Environmental Principles and Their Application in International, European Community and Czech Law", is concerned with the problems of environmental principles as part of legal order. The special nature of environmental law implies the specific attributes of these principles. My task is to demonstrate and to give reasons for these special features. It requires previous investigation into their relation to the universal definition of the concept of "principle". I have used the comparative and teleological method with a view to contribute towards understanding the sense of environmental principles as instruments of the environmental protection The thesis is composed of two parts, each of them is dealing wi...