The Bhagirathi is one of the two major tributaries of the Ganga. It originates from the Gangotri glacier in Uttaranchal, India and flows for about 700 km before merging with the Alaknanda at Deoprayag . After the confluence (Sangam) at Deoprayag, the river is known as the Ganga or Ganges.

The Bhagirathi is a traditionally sacred river to the Hindus of India, and is named after a mythological king named Bhagiratha, who is said to have brought the river down from heaven in order the redeem the souls of his ancestors.

The controversial Tehri dam lies on the Bhagirathi near Tehri.