Nong Saeng (Thai: หนองแซง, pronounced [nɔ̌ːŋ sɛ̄ːŋ]) is a district (amphoe) of Saraburi province, central Thailand.

[2] The most people of Nong Saeng migrated from Vientiane.

They established their new town near a pond surrounded by saeng trees, so they named their new town Ban Nong Saeng.

Neighboring districts are (from the north clockwise) Sao Hai, Mueang Saraburi, Nong Khae of Saraburi Province, and Phachi and Tha Ruea of Phra Nakhon Si Ayutthaya province.

This Saraburi Province location article is a stub.