Phylum: Articulate animals (Arthropoda)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Øygårdsvannet | Agder, Norway | 10 | 10 | 0 | 2015-06-20 | |
| Øyjordvatnet | Nordland, Norway | 1 | 1 | 0 | 2006-06-01 | |
| Øymark kirke | Østfold, Norway | 7 | 7 | 4 | 2015-04-19 | |
| Øymarksjøen | Østfold, Norway | 19 | 19 | 0 | 1997-05-29 | |
| Øyne | Agder, Norway | 10 | 1 | 0 | 2005-08-25 | |
| Øynefjorden | Vestland, Norway | 5 | 5 | 4 | 2010-07-04 | |
| Øyraveen 25 | Nordland, Norway | 1 | 1 | 0 | 2023-06-11 | |
| Øyrtangen | Rogaland, Norway | 36 | 36 | 11 | 2010-08-13 | |
| Øystese | Vestland, Norway | 1 | 1 | 0 | 2012-04-10 | |
| Øytangen | Telemark, Norway | 64 | 64 | 0 | 2016-08-29 | |
| Øytangen, Jomfruland | Telemark, Norway | 367 | 159 | 36 | 2015-07-12 | |
| Å barneskole | Agder, Norway | 1 | 1 | 0 | 2008-04-28 | |
| Åalia | Møre og Romsdal, Norway | 1 | 1 | 1 | 2018-05-21 | |
| Åbogsmoen | Innlandet, Norway | 3 | 3 | 3 | 2016-07-10 | |
| Åbøgrend | Telemark, Norway | 1 | 1 | 0 | 2020-04-28 | |
| Åbålvika | Agder, Norway | 1 | 1 | 0 | 2010-06-24 | |
| Ådalen | Møre og Romsdal, Norway | 3 | 3 | 3 | 2019-07-09 | |
| Ådalsvollen | Trøndelag, Norway | 1 | 1 | 0 | 2007-04-15 | |
| Ådland | Vestland, Norway | 1 | 1 | 0 | 2011-04-08 | |
| Ådlandsand | Rogaland, Norway | 3 | 2 | 1 | 2014-06-26 | |
| Ådneskår | Agder, Norway | 1 | 1 | 1 | 2005-07-15 | |
| Åfarnes | Møre og Romsdal, Norway | 3 | 3 | 0 | 2010-08-04 | |
| Åfarnes | Møre og Romsdal, Norway | 106 | 5 | 0 | 1995-09-27 | |
| Åfjord | Trøndelag, Norway | 27 | 6 | 0 | 1995-09-14 | |
| Åfjorden | Trøndelag, Norway | 2 | 1 | 0 | 2007-04-03 | |
| Ågotnes | Vestland, Norway | 1 | 1 | 1 | 2008-04-20 | |
| Ågskardet | Nordland, Norway | 1 | 1 | 0 | 2008-04-22 | |
| Ågårdsdam | Troms, Norway | 25 | 23 | 0 | 2013-09-13 | |
| Åheim | Møre og Romsdal, Norway | 119 | 5 | 0 | 1997-10-08 | |
| Åkra | Rogaland, Norway | 4 | 4 | 7 | 2019-06-18 | |
| Åkrasand | Rogaland, Norway | 4 | 4 | 2 | 2021-08-21 | |
| Åkrasanden | Rogaland, Norway | 31 | 26 | 7 | 2010-07-17 | |
| Åkrehamn | Rogaland, Norway | 50 | 3 | 0 | 1994-11-25 | |
| Åkrehamn | Rogaland, Norway | 1 | 1 | 0 | 2010-07-15 | |
| Åkresanden | Rogaland, Norway | 1 | 1 | 0 | 2010-06-06 | |
| ålekjern | Telemark, Norway | 1 | 1 | 0 | 2021-05-27 | |
| Ålesundsaksla | Møre og Romsdal, Norway | 17 | 14 | 0 | 1999-10-07 | |
| Åletjern | Telemark, Norway | 7 | 7 | 0 | 2000-06-06 | |
| Ålgård | Rogaland, Norway | 1 | 1 | 1 | 2011-06-30 | |
| Ålmo | Trøndelag, Norway | 1 | 1 | 0 | 2007-04-30 | |
| Ålvatnet | Trøndelag, Norway | 62 | 17 | 0 | 2013-09-04 | |
| Åmillom | Innlandet, Norway | 28 | 28 | 4 | 2010-08-21 | |
| Åmli sentrum | Agder, Norway | 3 | 3 | 0 | 2010-06-29 | |
| Åmodt - Kikut | Oslo, Norway | 6 | 6 | 3 | 2011-07-09 | |
| Åmodtdammen | Akershus, Norway | 1 | 1 | 1 | 2008-04-23 | |
| Åmotsdal | Telemark, Norway | 3 | 3 | 0 | 2007-07-12 | |
| Åmotsdal | Telemark, Norway | 1 | 1 | 1 | 2009-06-28 | |
| Årabrot | Rogaland, Norway | 1 | 1 | 0 | 2022-08-15 | |
| Årabrot | Rogaland, Norway | 1 | 1 | 0 | 2006-06-07 | |
| Årdalen | Rogaland, Norway | 5 | 5 | 0 | 2016-06-10 | |
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