Hafslundsøy is a small island located in the middle of the river Glomma just outside Sarpsborg in Østfold, Norway. It had 2,673 inhabitants in 2016.
  Hafslundsøy | |
| Geography | |
|---|---|
| Location | Glomma |
| Coordinates | 59°17′22″N 11°09′05″E / 59.28944°N 11.15139°E |
| Administration | |
| Demographics | |
| Population | 2,673 (2016) |
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