Phiao Duangjai Hiransri is a Thai actress. She graduated in the Department of Drama of Faculty of Liberal Arts (Faculty of Fine and Applied Arts today) from Thammasat University and is a member of the Anatta Theatre Troupe.

She is best known for her appearances in an award winning Swedish drama series called "30 Degrees in February" which went on for two seasons between 2012 to 2016. She played a (male to female) transgender character named Oh.

Duangiai was nominated for Best Supporting Actress by the 25th 'Thailand National Film Association' (The Suphannahong National Film Awards) for her role in The 'Blue Hour' in 2015.