Ust-Ayaz (Russian: Усть-Аяз; Bashkir: Усть-Әйәҙ, Ust-Äyäź) is a rural locality (a village) in Duvansky District, Bashkortostan, Russia.

Ust-Ayaz is located 104 km northwest of Mesyagutovo (the district's administrative centre) by road.

Zaimka is the nearest rural locality.

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