The objective of this study is to introduce the public trust doctrine and to examine its application inrelation to sustainable development. To facilitate this study judgments of the superior courts of SriLanka, India, the United States and several other countries are referred to.The international instruments relating to environment demonstrate the concern of the internationalcommunity for a healthy environment for all life forms including human beings through sustainabledevelopment. Sustainable development according to Bruntland Report (1987) is the development thatmeets the needs of the present without compromising the ability of the future generations to meettheir O\:n needs. The public trust doctrine is an essential element of judicial p...