Nam Mae Phong (Thai: น้ำแม่ผง, pronounced [náːm mɛ̂ː pʰǒŋ]) is a watercourse of Thailand with its source in the Phi Pan Nam Range. It is a tributary of the Yom River, part of the Chao Phraya River basin.

Coordinates: 19°07′N 100°16′E / 19.117°N 100.267°E / 19.117; 100.267