| Official Name: | Bang Waek |
| Native Name: | บางแวก |
| Settlement Type: | Khwaeng |
| Subdivision Type: | Country |
| Subdivision Type2: | Province |
| Subdivision Name2: | Bangkok |
| Subdivision Type3: | Khet |
| Subdivision Name3: | Phasi Charoen |
| Area Total Km2: | 3.022 |
| Area Footnotes: | [1] |
| Population As Of: | 2020 |
| Population Total: | 18757 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Postal Code Type: | Postal code |
| Blank Name: | TIS 1099 |
Bang Waek (th|บางแวก, pronounced as /th/) is a khwaeng (sub-district) of Phasi Charoen District, Bangkok's Thonburi side. The subdistrict contains 11 administrative villages.
It is named after Khlong Bang Waek, that runs through the area. It is a tributary of Khlong Chak Phra and flows into the Khlong Bangkok Noi.[2]
In the early Rattanakosin period, Khlong Bang Waek and its basin considered as the tip of betel large market Talat Phlu, which is in Thon Buri District.[3]
Bang Waek can be considered as a northern part of the district, with total area of 2.29 km2 (0.88 mi2).[4]
Neighboring subdistricts are (from north clockwise): Bang Chueak Nang of Taling Chan District, Khuha Sawan, Bang Chak and Bang Duan with Khlong Khwang in the same district.[5]
The prominent local temple Wat Bang Waek is in Khuha Sawan Sub-district.[2]