| Official Name: | Huai Hia |
| Native Name: | ห้วยเฮี้ย |
| Settlement Type: | Tambon |
| Subdivision Type3: | District |
| Subdivision Name3: | Nakhon Thai District |
| Subdivision Type2: | Province |
| Subdivision Name2: | Phitsanulok |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Population As Of: | 2005 |
| Population Total: | 6,357 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 16.9167°N 100.9°W |
| Elevation M: | 357 |
| Postal Code Type: | Postal code |
| Postal Code: | 65120 |
| Blank Name: | Geocode |
| Blank Info: | 650211 |
Huai Hia (Thai: ห้วยเฮี้ย) is a subdistrict in the Nakhon Thai District of Phitsanulok Province, Thailand.
Huai Hia is on a plateau in the Nan Basin, which is part of the Chao Phraya Watershed.
The subdistrict's mubans, (villages):[1]
| No. | English | Thai | |
| 1 | Ban Huai Kok | บ้านห้วยกอก | |
| 2 | Ban Pa Khai | บ้านป่าคาย | |
| 3 | Ban Huai Hia | บ้านห้วยเฮี้ย | |
| 4 | Ban Sam Roo | บ้านซำรู้ | |
| 5 | Ban Lat Khio | บ้านลาดคื้อ | |
| 6 | Ban Huai Sai Nuea | บ้านห้วยทรายเหนือ | |
| 7 | Ban Kaeng Sat | บ้านแก่งลาด | |
| 8 | Ban Tha Khian Thong | บ้านตะเคียนทอง | |
| 9 | Ban Sap Sopa | บ้านทรัพย์โสภา | |
| 10 | Ban Sam Phan | บ้านสัมพันธ์ |
The economy of Huai Hia is based on agriculture.[2]
Huai Hia's main attraction is its waterfalls:[2]