| Sidayu | |
| Settlement Type: | District (kecamatan) |
| Subdivision Type: | Country |
| Subdivision Name: |  Indonesia |
| Subdivision Type1: | Province |
| Subdivision Name1: | East Java |
| Subdivision Type2: | Regency |
| Subdivision Name2: | Gresik |
| Population Total: | 37871 |
| Population As Of: | 2010 |
| Area Total Km2: | 47.13 |
| Parts Type: | Villages/Sub-districts |
| Parts Style: | para |
| P1: | 21 |
| Population Density Km2: | auto |
Sidayu is a sub-district (id:kecamatan) in Gresik Regency, Indonesia.[1] The district lays to the north of Gresik. The district has a long history associated with merchants.[2]