This article critically analyses the principles of interfaith marriage in the light of classical discourse of Islam. The fundamental concern of the paper is to study the issue of interfaith marriage in which one of the spouses to such marriage is professing Islam while another is ahl e kitab (people of the Book). It also studies the reasons behind the unanimity on prohibition of interfaith marriage between Muslim women and Scriptural men. The study has mainly been conducted based on the primary sources of Islamic Shariah and law including the Holy Quran and the Sunnah of the Holy prophet. Illustrations have been cited from the Seerah (the life of holy Prophet Pbuh). This paper also refers briefly to Objectives of Shari’ah (Maqasid al Sharia) as well as Principle of the law (al qawa’id al fiqhiyyah). Moreover, the juristic approach of classical scholars provides the readers the legal basis on the matter of interfaith marriage. The article aims at giving a broader perspective on interfaith marriage while comparing its view with other religions. This paper also studies the practical issues of interfaith marriage suggesting solutions according to classical Islamic discourse.