Tha Yang (Thai: ท่ายาง, pronounced [tʰâː jāːŋ]) is a district (amphoe) in the southern part of Phetchaburi province, western Thailand.

The main trees are Makha (Monkey Pod wood, Afzelia xylocarpa), Takhian (Ironwood, Hopea odorata) and Yang (Dipterocarpus alatus).

Thus when the government established the district, they named it Tha Yang (literally, 'Yang tree pier').

The district is divided into 12 sub-districts (tambons), which are further subdivided into 119 villages (mubans).

Missing numbers belonged to tambon which now form Kaeng Krachan District.