- Indian history and culture
- International relations
- Diplomacy
- Nuclear policy
- Economic development
His books include:
- Discovery of Indian History
- The Politics of Nonalignment
- An Idea of India
- The Ganga: Glory of India
- The Buddha and the Future
- Perspectives on India: Past and Present
He has also served as the Editor of several journals and publications, including:
- India International Centre Quarterly
- The Millennium Book Series
- The Journal of the Royal Asiatic Society of Great Britain and Ireland
Dhar's work has been widely acclaimed for its insights into Indian history, culture, and foreign policy. He is considered one of India's leading intellectuals and his writings continue to be influential in India and around the world.