Dede-Sutoy (Russian: Дэдэ-Сутой; Buryat: Дээдэ Сγтэй, Deede Sütei) is a rural locality (an ulus) in Selenginsky District, Republic of Buryatia, Russia.

[2] Dede-Sutoy is located 33 km east of Gusinoozyorsk (the district's administrative centre) by road.

Tokhoy is the nearest rural locality.

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