Mehrdad Bahar (Persian: مهرداد بهار, pronunciation: Mehrdād Bahār) (1929, in Tehran – 13 November 1994, in Tehran) was a prominent Iranist, linguist, mythologist and Persian historian.

He graduated from Tehran University with a Ph.D. in Persian literature and ancient Iranian languages.

He received an MA degree in ancient and medieval Persian history from the University of London where he studied with Professor Mary Boyce at the School of Oriental and African Studies.

Bahar's most notable work is his translation of the well-known Middle Persian text, Bondahesh(n).

His colleague, Katayun Mazdapour, completed the editing task the following year.