Balaji Baji Rao (8 December 1720 - 23 June 1761), commonly known as Nana Saheb I, was the eighth Peshwa of the Maratha Empire. He succeeded his father, Baji Rao I, as Peshwa in 1740.

During his tenure, the Chhatrapati (Maratha monarch) served largely as a titular head, while effective power remained with the Peshwa. Under Balaji Baji Rao's administration, the Maratha Empire evolved