| Official Name: | Lohajong |
| Native Name: | লৌহজং |
| Settlement Type: | Upazila |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Name1: | Dhaka |
| Subdivision Type2: | District |
| Subdivision Name2: | Munshiganj |
| Population Total: | 177802 |
| Population As Of: | 2022 |
| Population Footnotes: | [1] |
| Population Density Km2: | auto |
| Area Total Km2: | 131.10 |
| Timezone: | BST |
| Utc Offset: | +6 |
| Coordinates: | 23.4667°N 90.3417°W |
| Postal Code Type: | Postal code |
| Postal Code: | 1530[2] |
| Area Code: | 06923[3] |
Lohajang (bn|লৌহজং [meaning ''rusting of iron'']) is an upazila of Munshiganj District[4] in Dhaka Division, Bangladesh.
Lohajang is located at 23.4667°N 90.3417°W on the south bank of Padma River. It has a total area of 131.10 km2.
According to the 2011 Census of Bangladesh, Louhajang Upazila had 35,978 households and a population of 159,242. 33,395 (20.97%) inhabitants were under 10 years of age. Louhajang had a literacy rate (age 7 and over) of 56.22%, compared to the national average of 51.8%, and a sex ratio of 1009 females per 1000 males. 4,945 (3.11%) lived in urban areas.[5] [6]
Louhajang Upazila is divided into ten union parishads:
The union parishads are subdivided into 115 mauzas and 114 villages.