| Official Name: | Sala Thammasop |
| Native Name: | ศาลาธรรมสพน์ |
| Settlement Type: | Khwaeng |
| Subdivision Type: | Country |
| Subdivision Type2: | Province |
| Subdivision Name2: | Bangkok |
| Subdivision Type3: | Khet |
| Subdivision Name3: | Thawi Watthana |
| Area Total Km2: | 28.698 |
| Area Footnotes: | [1] |
| Population As Of: | 2020 |
| Population Total: | 55590 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Postal Code Type: | Postal code |
| Blank Name: | TIS 1099 |
Sala Thammasop (Thai: ศาลาธรรมสพน์, in Thai pronounced as /sǎː.lāː tʰām.mā.sòp/) is a khwaeng (sub-district) of Bangkok's Thawi Watthana district. It has an area of 28.698 km2 (about 11 mi2).
The name Sala Thammasop refers to a 'pavilion for sermons', but in the past it was called Sala Tham Sop meaning 'funeral pavilion'. King Mongkut (Rama IV) ordered the digging of the (Khlong Maha Sawat) with salas (pavilions) along the banks of the canal. There were twin salas for disposing of the bodies of those who died digging the canal. It was called Sala Tham Sop. After World War II, its name was changed to the more pleasant-sounding Sala Thammasop. Another of the salas was Salaya, a sala that housed medical textbooks. It became the name of Salaya Subdistrict of Phutthamonthon District.