Karlsøya can refer to several islands in Norway:
- Karlsøya (Møre og Romsdal), an island in Molde municipality, Møre og Romsdal county
 - Karlsøya (Nord-Trøndelag), an island in Nærøysund municipality, Trøndelag county
 - Karlsøya (Nordland), an island in Bodø municipality, Nordland county
 - Karlsøya (Sør-Trøndelag), an island in Ørland municipality, Trøndelag county
 - Karlsøya (Troms), an island in Karlsøy municipality, Troms og Finnmark county
 - Karlsøya (Østfold), an island in Sarpsborg municipality, Østfold county
 
See also
- Karlsøy, a municipality in Troms county, Norway
 
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