| Official Name: | Na Yai Am |
| Native Name: | นายายอาม |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Chanthaburi |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Na Yai Am |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 32,108 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 22160 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 2209 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 12.77°N 101.855°W |
Na Yai Am (Thai: นายายอาม, in Thai pronounced as /nāː jāːj ʔāːm/) is a district (amphoe) in the western part of Chanthaburi province, eastern Thailand.
The district was created on 1 April 1992 by splitting off the five western tambons of Tha Mai district.[1] It was upgraded to a full district on 5 December 1996.[2]
Its name "Na Yai Am" directly translates as "grandma Am's rice field". This was because here in the past was the residence and rice field of an old woman named Yai Am (grandma Am) and a place where people passed by. Therefore, called by name of the owner.[3]
Neighbouring districts are (from the west clockwise) Klaeng of Rayong province, Kaeng Hang Maeo, and Tha Mai of Chanthaburi Province. To the southwest is the Gulf of Thailand.
The district is divided into six sub-districts (tambons), which are further subdivided into 67 villages (mubans). Na Yai Am is a township (thesaban tambon) which covers parts of tambon Na Yai Am. There are a further six tambon administrative organizations (TAO) responsible for the non-municipal areas.
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Na Yai Am | นายายอาม | 15 | 9414 | ||
| 2. | Wang Tanot | วังโตนด | 10 | 3532 | ||
| 3. | Krachae | กระแจะ | 11 | 4671 | ||
| 4. | Sanam Chai | สนามไชย | 8 | 4349 | ||
| 5. | Chang Kham | ช้างข้าม | 13 | 4739 | ||
| 6. | Wang Mai | วังใหม่ | 10 | 5403 |