| Long Semirang | |
| Coordinates: | 3.7833°N 115.3833°W |
| Pushpin Map: | Borneo |
| Pushpin Label Position: | right |
| Subdivision Type: | Country |
| Subdivision Name: |  Malaysia |
| Subdivision Type1: | State |
| Subdivision Type2: | Administrative Division |
| Subdivision Name2: | Marudi |
| Elevation M: | 489 |
Long Semirang is a settlement in the Marudi division of Sarawak, Malaysia. It lies approximately 612.4km (380.5miles) east-north-east of the state capital Kuching.
About seven Penan families have settled in the nearby village of Lond Medamot and have learnt the skills of rice farming from Kelabits in Long Manau and Long Semirang.
Neighbouring settlements include: