| Official Name: | Bang Lamphu Lang |
| Native Name: | บางลำภูล่าง |
| Settlement Type: | Khwaeng |
| Subdivision Type: | Country |
| Subdivision Type2: | Province |
| Subdivision Name2: | Bangkok |
| Subdivision Type3: | Khet |
| Subdivision Name3: | Khlong San |
| Area Total Km2: | 2.234 |
| Area Footnotes: | [1] |
| Population As Of: | 2020 |
| Population Total: | 23513 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Postal Code Type: | Postal code |
| Blank Name: | TIS 1099 |
Bang Lamphu Lang (Thai: บางลำภูล่าง, in Thai pronounced as /bāːŋ lām.pʰūː lâːŋ/) is a khwaeng (subdistrict) of Khlong San district, Bangkok's Thonburi side (west bank of Chao Phraya river).
Originally, Bang Lamphu Lang was a name of all Khlong San area. Its name changed to Khlong San in the reign of King Vajiravudh (Rama VI). It became part of Bangkok after the merging of Thonburi and Phra Nakhon provinces in 1971.
Its name "Bang Lamphu Lang" meaning "lower place of mangrove apples". Its name has a similar origin to Bang Lamphu in Phra Nakhon side (ฺBangkok core). Because, in the past it was considered an area adjacent to the Chao Phraya river and was a source of mangrove apples (Sonneratia caseolaris, or lamphu in Thai) that grow along the river banks. These trees are also the habitat of fireflies. Today, alike to Bang Lamphu, although mangrove apples and fireflies have disappeared, but its name is still used for this area.
Bang Lamphu Lang (including other areas of Khlong San) in the past was the location of many large businesses, such as salt warehouse, fish sauce factory, wheat flour mill, saw mill and tannery. It was also the home of a rich family of Thai Chinese descent, such as Wanglee, Pisolyabutra, Kiangsiri, including an influential noble family Bunnag. Later on, an Indian businessman Ibrahim Ali Nana bought and rented land in this area to live and conduct business among the fellow Indians, until becoming an Indian settlement. He was an ancestor of the Nana family, whose descendants include Lek Nana.[2]
Bang Lamphu Lang has an area of 2.47 km2 (0.95 mi2).[3]
Charoen Nakhon road is a main route of the subdistrict.
Neighbouring subdistricts are (from the north clockwise): Khlong Ton Sai in its district, Yan Nawa of Sathon district and Wat Phraya Krai of Bang Kho Laem district (across Chao Phraya river), Samre and Bukkhalo of Thon Buri district.[4]