Saikhan-Ovoo (Mongolian: Сайхан-Овоо, Beautiful ovoo) is a sum (district) in central Mongolia.

The sum center is on the single perennial river of Dundgovi Province, the Ongi gol.

Formerly one of the largest monasteries in Mongolia, it was founded in 1660 and consisted of two temples complexes on the North and South of the Ongi Gol river.

It was completely destroyed in 1939 under Khorloogiin Choibalsan, the then president and leader of the Communist Party of Mongolia.

A large number of ruins including a tall stupa can be seen on the river and on the surrounding hills.