Sei Dam (also known as the Sei Diversion Dam) is an earthen gravity dam on the Sei River, a tributary of Sabarmati River, in Kotra tehsil in Udaipur district of Rajasthan, India. The primary purpose of the dam is to store water to be diverted to the Jawai Dam on the Jawai River in Pali district.

The catchment area of the Sei River at the dam site is 320 square kilometres. Construction of the Sei Dam was started in 1977 and completed in 1978 at the cost of Rs. 4.07 crores.