The Supreme Court of India has emerged as the most vigorous organ of State and amongst the foremost constitutional courts in the world through the instrument of Public Interest Litigation (PIL), the exercise of writ jurisdiction and the expansive interpretation of fundamental rights guaranteed by the Constitution of India. Judicial activism impinging on every facet of governance has become the norm in recent times. This paper traces the evolution of judicial activism since independence through pronouncements of the Supreme Court. The paper illustrates through judgements of the Supreme Court that the instrument of the PIL and the exercise of writ jurisdiction by the Supreme Court go beyond the traditional postulates of judicial processes and also the scheme of judicial activism under the Indian Constitution.