Sredny Saydys (Russian: Средний Сайдыс; Altay: Орто Сайдыс, Orto Saydıs) is a rural locality (a selo) in Kyzyl-Ozyokskoye Rural Settlement of Mayminsky District, the Altai Republic, Russia.

Sredny Saydys is located on the Saydys River, 43 km southeast of Mayma (the district's administrative centre) by road.

Alexandrovka is the nearest rural locality.

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