For reference only — not regular or reliable sightings.
Iceland's position between the Arctic, Europe and North America makes it a magnet for storm-blown rarities. These species are excluded from the main finder above because they are unpredictable, non-resident, and unsuitable for regular beginner birdwatching.
| Species | Notes |
|---|---|
| King Eider (Æðarkóngur) | Arctic sea duck; scarce but almost annual among Common Eider flocks, mostly in the north. |
| Snowy Owl (Snæugla) | Huge white Arctic owl; very rare, mostly recorded in the central highlands. |
| Ivory Gull (Ísmáfur) | All-white high-Arctic gull; extremely rare winter vagrant. |
| Ring-necked Duck | North American diving duck; scarce but increasingly regular winter vagrant. |
| American Wigeon | North American duck occasionally found among Eurasian Wigeon flocks. |
| Yellow-billed Loon (White-billed Diver) | Scarce but near-annual winter visitor from Arctic Russia/North America. |
| Black-browed Albatross | Ocean wanderer from the Southern Hemisphere; recorded only a handful of times. |
| Little Auk | Tiny high-Arctic auk; scarce visitor, occasionally storm-driven ashore in large numbers. |
| Sabine's Gull | Elegant, forked-tail Arctic gull seen mainly on autumn passage offshore. |
| European Bee-eater | Dazzling multicoloured rare spring/summer overshoot from southern Europe. |
| Hoopoe | Colourful crested vagrant from continental Europe, most often in spring. |
| American Robin | Nearctic thrush occasionally carried across the Atlantic by winter storms. |