Vidya Dhar Mahajan (1913 — 10 July 1990) was an Indian historian, political scientist, and advocate.

Mahajan was born in 1913 in Punjab, British India He did M.A. twice – in History at the D.A.V. College, Lahore and in Political Science at the University of the Punjab.^[5] In 1945, he completed Ph.D. in Political Science from the University of the Punjab, and later did LL.B. from the University of Delhi. He served as a professor of "history and politics" at the Sanatan Dharma College in Lahore, and later as a professor of history at the Pantas U. College in New Delhi and at the Panjab University in Chandigarh. Mahajan was a member of the Indian History Congress Association\ He studied India's early, ancient, modern, and constitutional history. He also studied the Indian nationalist movement and international politics. He was also an advocate at the Supreme Court of India.

He was married to Savitri Shori Mahajan who was a historian. Their daughters Sucheta Mahajan and Mridula Mukherjee.