Nong Kathao () is a subdistrict in the Nakhon Thai District of Phitsanulok Province, Thailand.
Nong Kathao is bordered to the north by Tha Sakae, to the east by Noen Phoem, to the south by Huai Hia and to the west by Kaeng Sopha.
Nong Kathao lies in the Nan Basin, which is part of the Chao Phraya Watershed.
The following is a list of the subdistrict's mubans (villages):
The following points of interest are located within the subdistrict: