| Om Noi | |
| Official Name: | City of Om Noi Thai: เทศบาลนครอ้อมน้อย |
| Native Name: | Thai: อ้อมน้อย |
| Settlement Type: | City Municipality |
| Motto: | Thai: ศรัทธาหลวงพ่อเพ็ง หลวงพ่อพักตร์ อนุรักษ์วัฒนธรรมไทย ลือไกลอุตสาหกรรม งามล้ำเบญจรงค์ |
| Pushpin Map: | Bangkok Metropolitan Region#Thailand |
| Pushpin Label: | Om Noi |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Bangkok Metropolitan Region##Location in Thailand |
| Coordinates: | 13.7001°N 100.3241°W |
| Subdivision Type1: | Region |
| Subdivision Name1: | Central Thailand |
| Subdivision Type2: | Province |
| Subdivision Name2: | Samut Sakhon |
| Subdivision Type3: | District |
| Subdivision Name3: | Krathum Baen |
| Government Type: | City Municipality |
| Leader Title: | Mayor |
| Leader Name: | Somsak Khwan |
| Leader Title1: | Vice Mayor |
| Area Total Km2: | 30.40 |
| Population As Of: | 2014 |
| Population Total: | 52457 |
| Population Density Km2: | auto |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Geocode: | 7497 |
| Area Code: | (+66) 2 |
| Area Code Type: | Area code |
| Postal Code: | 74130 |
| Postal Code Type: | Postcode |
Om Noi (Thai: อ้อมน้อย,) officially the City of Om Noi (Thai: เทศบาลนครอ้อมน้อย,) is a municipality in Samut Sakhon, Thailand. It is located 13 km west from Bangkok.