| Official Name: | Mae Poen |
| Native Name: | แม่เปิน |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Nakhon Sawan |
| Subdivision Type2: | Tambon |
| Subdivision Type3: | Muban |
| Seat Type: | Seat |
| Seat: | Mae Poen |
| Established Title: | District established |
| Population Total: | 19730 |
| Population As Of: | 2005 |
| Population Density Km2: | auto |
| Area Total Km2: | 260.2 |
| Postal Code Type: | Postal code |
| Postal Code: | 60150 |
| Blank Name Sec1: | Geocode |
| Blank Info Sec1: | 6014 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.6578°N 99.4692°W |
Mae Poen (Thai: แม่เปิน, in Thai pronounced as /mɛ̂ː pɤ̄n/) is a district (amphoe) in the western part of Nakhon Sawan province, central Thailand.
Tambon Mae Poen was separated from Lat Yao district to become a minor district (king amphoe) on 15 July 1996.[1]
On 15 May 2007, all of Thailand's 81 minor districts were upgraded to full districts.[2] With publication in the Royal Gazette on 24 August, the upgrade became official.[3]
Neighboring districts are (from the north clockwise): Mae Wong and Chum Ta Bong of Nakhon Sawan Province, Lan Sak and Ban Rai of Uthai Thani province, and Umphang of Tak province.
The district is divided into a single sub-district (tambon), which is further subdivided into 24 villages (mubans). There are no municipal (thesaban) areas, and a single tambon administrative organization (TAO).