Nong Phrao Ngai (Thai: หนองเพรางาย, pronounced [nɔ̌ːŋ pʰrāw ŋāːj]) is one of the seven subdistricts (tambon) of Sai Noi District, in Nonthaburi Province, Thailand.

Neighbouring subdistricts are (from north clockwise) Thawi Watthana, Bang Khu Rat, Ban Mai, Khlong Yong and Naraphirom.

[2] The subdistrict is subdivided into 12 administrative villages (muban).

[3] The whole area of the subdistrict is covered by Nong Phrao Ngai Subdistrict Administrative Organization (องค์การบริหารส่วนตำบลหนองเพรางาย).

This Nonthaburi Province location article is a stub.