| Official Name: | Karerhat Union |
| Settlement Type: | Union |
| Pushpin Map: | Bangladesh |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Bangladesh |
| Subdivision Type: | Country |
| Subdivision Name: | Chittagong  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Type2: | District |
| Subdivision Type3: | Upazilas |
| Subdivision Name1: | Chittagong Division |
| Subdivision Name2: | Chittagong District |
| Subdivision Name3: | Mirsharai Upazila |
| Area Total Km2: | 148 |
| Population Total: | 29,977 |
| Population As Of: | 2001 |
| Timezone: | BST |
| Utc Offset: | +6 |
Karerhat Union is a union, the smallest administrative body of Bangladesh, located in Mirsharai Upazila, Chittagong District, Bangladesh. The total population is 29,977.[1]