Vaitarna Dam, also called Modaksagar Dam, is a Gravity dams on Vaitarna river which supplies water to Palghar, Mumbai, but located in Palghar & Nashik district in the state of Maharashtra in India.

It was opened in 1957.

Another dam, the Middle Vaitarna Dam is to be built in the neighboring Palghar & Thane district on the same river; to supplement the water supply to the ever-growing needs of Mumbai and its Mumbai Metropolitan Region.

The height of the dam above lowest foundation is 82 m (269 ft) while the length is 567.07 m (1,860.5 ft).

The gross storage capacity is 204,980.00 m3 (7,238,800 cu ft).