Tsaydam (Russian: Цайдам; Buryat: Сайдам, Saidam) is a rural locality (an ulus) in Selenginsky District, Republic of Buryatia, Russia.

Tsaydam is located 36 km southwest of Gusinoozyorsk (the district's administrative centre) by road.

Gusinoye Ozero is the nearest rural locality.

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