Ust-Ayaz (; , Ust-Äyäź) is a rural locality (a village) in Duvansky District, Bashkortostan, Russia. The population was 227 as of 2010.Всероссийская перепись населения 2010 года. Численность населения по населённым пунктам Республики Башкортостан There are 5 streets.
Geography Ust-Ayaz is located 104 km northwest of Mesyagutovo (the district's administrative centre) by road. Zaimka is the nearest rural locality.Расстояние от Усти-Аяза до Месягутова
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