Actors, Factors and Dynamics are the driving force of International Relations (IR). Ideologies often work as a beacon, shield or a guide for a nation while making of its foreign policy. Idealism and realism have been two most dominant ideologies of IR during 19th and 20th century. Both of them are continuously contesting to hegemonies each other since then. This research paper is an attempt to explain the continuity and explore the changes and examine the future implications of theory of idealism and realism on Indian foreign policy. The post independent Nehruvian Foreign Policy which was predominantly idealist with the pinch of realism in few instances like adopting mixed economic model and leadership of Non- Alignment Movement (NAM). The research work passes through Mrs. Indira Gandhi era, which was absolutely an era of realism in Indian foreign policy. Then Rajiv Gandhi government believed in a balance of both the ideas and maintained a status – quo. During 1990s despite of political turmoil foreign policy was guided with realism which opened Indian economy and doors of globalization. Economic considerations remained predominant factor to determine national interest. After 1998 the government under A. B. Vajpayee also followed realism as the guiding principal of foreign policy, which was continued by UPA government under Dr. Manmohan Singh till 2014. The change of regime in 2014 brought NDA government led by a strong and most popular leader Narendra Modi in power. He has made foreign policy and IR a vibrant policy area. Through his extensinve outreach to nations, leaders and people he left inedible footprints of realism in Indian foreign policy. This paper has looked into role of realism and idealism as a guiding principal in Indian foreign policy in its core (SAARC), periphery (Asia) and intruder (America, AU, EU, Latin America etc.) areas. It culminates with a possibility of extensive research in this area in future.