This is a list of the 50 largest islands in the North Sea.
| # | Island | Country | Location/Land | Area (km2) |
|---|---|---|---|---|
| 1. | Mainland | United Kingdom | Shetland | 969 |
| 2. | Mainland | United Kingdom | Orkney | 523 |
| 3. | Stord | Norway | Vestland | 241 |
| 4. | Yell | United Kingdom | Shetland | 212 |
| 5. | Tysnesøy | Norway | Vestland | 198 |
| 6. | Karmøy | Norway | Vestland | 177 |
| 7. | Sotra | Norway | Vestland | 176 |
| 8. | Bømlo | Norway | Vestland | 171 |
| 9. | Texel | Netherlands | North Holland | 162 |
| 10. | Rømø | Denmark | Skærbæk municipality | 128 |
| 11. | Unst | United Kingdom | Shetland | 121 |
| 12. | Radøy | Norway | Vestland | 103 |
| 13. | Askøy | Norway | Vestland | 99 |
| 14. | Sylt | Germany | Schleswig-Holstein | 99 |
| 15. | Isle of Sheppey | United Kingdom | Thames Estuary | 94 |
| 16. | Terschelling | Netherlands | Friesland | 88 |
| 17. | Holsnøy | Norway | Vestland | 88 |
| 18. | Föhr | Germany | Schleswig-Holstein | 82 |
| 19. | Fanø | Denmark | North Frisian Islands | 80 |
| 20. | Ameland | Netherlands | Friesland | 60 |
| 21. | Ombo | Norway | Rogaland | 58 |
| 22. | Huftarøy | Norway | Vestland | 50 |
| 23. | Gossa | Norway | Møre og Romsdal | 46.5 |
| 24. | Nøtterøy | Norway | Vestfold | 46.5 |
| 25. | Rennesøy | Norway | Rogaland | 46.5 |
| 26. | Schiermonnikoog | Netherlands | Friesland | 41 |
| 27. | Vlieland | Netherlands | Friesland | 40 |
| 28. | Atløy | Norway | Vestland | 38 |
| 29. | Pellworm | Germany | Schleswig-Holstein | 37 |
| 30. | Reksteren | Norway | Vestland | 37 |
| 31. | Vestre Bokn | Norway | Rogaland | 36 |
| 32. | Lindisfarne | United Kingdom | Northumberland | 35.41 |
| 33. | Ytre Sula | Norway | Vestland | 34 |
| 34. | Sandøyna | Norway | Vestland | 32 |
| 35. | Borkum | Germany | Niedersachsen | 31 |
| 36. | Kirkeøy | Norway | Østfold | 29.6 |
| 37. | Tromøya | Norway | Agder | 28.6 |
| 38. | Fosnøyna | Norway | Vestland | 26.3 |
| 39. | Norderney | Germany | Niedersachsen | 26 |
| 40. | Finnøy | Norway | Rogaland | 25 |
| 41. | Tjøme | Norway | Vestfold | 24.5 |
| 42. | Selbjørn | Norway | Vestland | 23.8 |
| 43. | Foulness | United Kingdom | Thames Estuary | 23.8 |
| 44. | Kråkerøy | Norway | Østfold | 23.6 |
| 45. | Amrum | Germany | Schleswig-Holstein | 20.46 |
| 46. | Hidra | Norway | Agder | 20 |
| 47. | Eigerøy | Norway | Rogaland | 19.9 |
| 48. | Langeoog | Germany | East Frisian Islands | 19.7 |
| 49. | Whalsay | United Kingdom | Shetland Islands | 19.7 |
| 50. | Jeløy | Norway | Østfold | 19 |