Language, language policy and curriculum issues occupy very important and strategic places in educational planning in any society. In a multilingual Nigerian society as well as in similar countries like Australia, India or even in seemingly homogeneous linguistic societies like Britain, language planning, development and policies are sin qua non. In this paper, the author has tried to look from the perspectives of the provisions of the National Policy on Education (1981) and the Constitution of the Federal Republic of Nigeria (1979), and examine the curriculum issues arising from the language and policy aspects in achieving the national educational aims, goals, objectives and development. This paper takes a cursory look at the constitutional and policy documents as well as the realities on ground in the secondary schools. It is discovered that this sub-sector of education is characterized with language implementation crisis. The disturbing issue is that, since the language of instruction is bedeviled with crisis, the whole educational system itself becomes a failure. The paper recommends that, Nigeria should carry out language policy reforms that will be acceptable and effective bearing in mind the role of language and language policy in education. (Contains 2 tables.)