| Official Name: | Mueang Chachoengsao |
| Native Name: | เมืองฉะเชิงเทรา |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Chachoengsao |
| Subdivision Type2: | Seat |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 158,722 |
| Population As Of: | 2017 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 24000 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 2401 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 13.6886°N 101.0708°W |
Mueang Chachoengsao (Thai: เมืองฉะเชิงเทรา, in Thai pronounced as /mɯ̄a̯ŋ t͡ɕʰàʔ.t͡ɕʰɤ̄ːŋ.sāw/), formerly named the Mueang Paet Rio District (Thai: เมืองแปดริ้ว), is the capital district (amphoe mueang) of Chachoengsao province, Eastern Thailand.
Mueang Chachoengsao district was established in 1896. The present district office is close to the bank of the Bang Pakong River in Na Mueang subdistrict.
Neighboring districts are (from the north clockwise): Bang Nam Priao, Khlong Khuean, Bang Khla, Ban Pho of Chachoengsao Province; Bang Bo of Samut Prakan province; Lat Krabang and Nong Chok of Bangkok.
The important water resource are the Bang Pakong River and Khlong Nakhon Nueang Khet.
Mueang Chachoengsao is divided into 19 subdistricts (tambons), which are further subdivided into 192 administrative villages (mubans).
| No. | Name | Thai | Villages | Pop.[1] | |
|---|---|---|---|---|---|
| 1. | Na Mueang | Thai: หน้าเมือง | - | 39,328 | |
| 2. | Tha Khai | Thai: ท่าไข่ | 17 | 10,498 | |
| 3. | Ban Mai | Thai: บ้านใหม่ | 5 | 2,857 | |
| 4. | Khlong Na | Thai: คลองนา | 5 | 4,988 | |
| 5. | Bang Tin Pet | Thai: บางตีนเป็ด | 13 | 8,963 | |
| 6. | Bang Phai | Thai: บางไผ่ | 10 | 4,866 | |
| 7. | Khlong Chuk Krachoe | Thai: คลองจุกกระเฌอ | 8 | 2,848 | |
| 8. | Bang Kaeo | Thai: บางแก้ว | 12 | 6,279 | |
| 9. | Bang Khwan | Thai: บางขวัญ | 14 | 6,909 | |
| 10. | Khlong Nakhon Nueang Khet | Thai: คลองนครเนื่องเขต | 17 | 7,703 | |
| 11. | Wang Takhian | Thai: วังตะเคียน | 10 | 6,487 | |
| 12. | Sothon | Thai: โสธร | 7 | 6,619 | |
| 13. | Bang Phra | Thai: บางพระ | 10 | 5,975 | |
| 14. | Bang Kahai | Thai: บางกะไห | 9 | 4,155 | |
| 15. | Nam Daeng | Thai: หนามแดง | 7 | 3,196 | |
| 16. | Khlong Preng | Thai: คลองเปรง | 12 | 10,283 | |
| 17. | Khlong Udom Chonlachon | Thai: คลองอุดมชลจร | 9 | 8,756 | |
| 18. | Khlong Luang Phaeng | Thai: คลองหลวงแพ่ง | 14 | 12,002 | |
| 19. | Bang Toei | Thai: บางเตย | 13 | 6,010 |
There is one town (thesaban mueang) in the district:
There is one subdistrict municipality (thesaban tambon) in the district:
There are 18 subdistrict administrative organizations (SAO) in the district: