| Official Name: | Khun Si Subdistrict |
| Native Name: | Thai: ตำบลขุนศรี |
| Settlement Type: | Subdistrict |
| Subdivision Type: | Country |
| Subdivision Type2: | Province |
| Subdivision Name2: | Nonthaburi |
| Subdivision Type3: | District |
| Subdivision Name3: | Sai Noi |
| Area Total Km2: | 22 |
| Area Footnotes: | [1] |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 5054 |
| Population Density Km2: | 229.73 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Postal Code Type: | Postal code |
| Blank Name: | TIS 1099 |
Khun Si (Thai: ขุนศรี, in Thai pronounced as /kʰǔn sǐː/) is one of the seven subdistricts (tambon) of Sai Noi District, in Nonthaburi Province, Thailand. Neighbouring subdistricts are (from north clockwise) Sai Yai, Rat Niyom, Khlong Khwang, Sai Noi, Thawi Watthana, Naraphirom and Bang Phasi. In 2020 it had a total population of 5,054 people.[2]
The subdistrict is subdivided into 8 administrative villages (muban).[3]
| No. | Name | Thai | |
|---|---|---|---|
| 1. | Ban Khlong Phra Phimon (Ban Plai Khlong Phra Phimon) | บ้านคลองพระพิมล (บ้านปลายคลองพระพิมล) | |
| 2. | Ban Khlong To Nui | บ้านคลองโต๊ะนุ้ย | |
| 3. | Ban Khlong Khun Si | บ้านคลองขุนศรี | |
| 4. | Ban Khlong Mom Chaem (Ban Wat Samoson) | บ้านคลองหม่อมแช่ม (บ้านวัดสโมสร) | |
| 5. | Ban Khlong Phra Phimon Racha (Ban Wat Samoson) | บ้านคลองพระพิมลราชา (บ้านวัดสโมสร) | |
| 6. | Ban Wat Yot Phra Phimon | บ้านวัดยอดพระพิมล | |
| 7. | Ban Pak Khlong Chao | บ้านปากคลองเจ้า | |
| 8. | Ban Khlong Sip Sok (Ban Khlong Thap) | บ้านคลองสิบศอก (บ้านคลองทับ) |
The whole area of the subdistrict is covered by Khun Si Subdistrict Administrative Organization (Thai: องค์การบริหารส่วนตำบลขุนศรี).