| Official Name: | Iisaku |
| Pushpin Map: | Estonia |
| Mapsize: | 200px |
| Subdivision Type: | Country |
| Subdivision Name: | Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Ida-Viru County |
| Population As Of: | 2011 Census |
| Population Total: | 761 |
| Timezone: | EET |
| Utc Offset: | +2 |
Iisaku is a small borough (Estonian: alevik) in northeastern Estonia. It is located in Ida-Viru county in Alutaguse Parish, around 30 km south from the town of Jõhvi. Iisaku was the administrative centre of Iisaku Parish. As of the 2011 census, the settlement's population was 761, of which the Estonians were 717 (94.2%).[1]