| Official Name: | Pak Khlong Phasi Charoen |
| Native Name: | ปากคลองภาษีเจริญ |
| Settlement Type: | Khwaeng |
| Subdivision Type: | Country |
| Subdivision Type2: | Province |
| Subdivision Name2: | Bangkok |
| Subdivision Type3: | Khet |
| Subdivision Name3: | Phasi Charoen |
| Area Total Km2: | 1.898 |
| Area Footnotes: | [1] |
| Population As Of: | 2018 |
| Population Total: | 14,778 |
| Population Density Km2: | 7,786.09 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Postal Code Type: | Postal code |
| Blank Name: | TIS 1099 |
Pak Khlong Phasi Charoen (Thai: ปากคลองภาษีเจริญ, in Thai pronounced as /pàːk kʰlɔ̄ːŋ pʰāː.sǐː t͡ɕā.rɤ̄ːn/) is a khwaeng (sub-district) of Phasi Charoen District, Bangkok's Thonburi side.
Its name "Pak Khlong Phasi Charoen" meaning "mouth of Phasi Charoen canal", because it is the confluence of khlongs (canal) Phasi Charoen and Bangkok Yai, regarded as the beginning of Khlong Phasi Charoen include the nearby area, also with a Khlong Dan that is separated from Khlong Bangkok Yai as well.[2]
The area is the southeast part of the district, with a total area of 0.50 km2 (0.19 mi2), it is the second-smallest subdistrict of the district (after Khuha Sawan).[3]
Neighbouring subdistricts are (from the north clockwise): Khuha Sawan and Bang Chak in its district, Wat Tha Phra of Bangkok Yai District, Talat Phlu of Thon Buri District, and Bang Wa in its district.[4]
National Highway 4 (Phet Kasem Road) is the main road. Ratchaphruek and Thoet Thai Roads are classified as minor road.
Bang Phai is a popular name used to call this area (shares with Khuha Sawan).