Phylum: Coelenterates (Cnidaria)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Herdla | Vestland, Norway | 33 | 2 | 0 | 1995-10-06 | |
| Herdla | Vestland, Norway | 6 | 3 | 0 | 2008-06-17 | |
| Hestvika | Trøndelag, Norway | 9 | 2 | 0 | 1995-01-02 | |
| Hetland | Rogaland, Norway | 6 | 2 | 0 | 1996-10-03 | |
| Hetlevik | Vestland, Norway | 39 | 2 | 0 | 1995-10-13 | |
| Hetlevikstraumen | Vestland, Norway | 1 | 1 | 0 | 2022-09-28 | |
| Hisøy | Agder, Norway | 60 | 2 | 0 | 1997-10-02 | |
| Hjelset | Møre og Romsdal, Norway | 15 | 2 | 0 | 1993-09-23 | |
| Hjørungavåg | Møre og Romsdal, Norway | 2 | 1 | 0 | 1993-11-08 | |
| Hodne/Reve (Bore) | Rogaland, Norway | 12 | 2 | 0 | 1993-09-01 | |
| Holmavegen 2 | Rogaland, Norway | 1 | 1 | 0 | 2018-06-05 | |
| Holmavike | Rogaland, Norway | 1 | 1 | 0 | 2000-06-16 | |
| Holmenskjæret | Akershus, Norway | 3 | 2 | 0 | 2017-09-15 | |
| Holmestrand | Vestfold, Norway | 49 | 2 | 0 | 1998-09-18 | |
| Holmestrand | Vestfold, Norway | 4 | 2 | 0 | 1994-11-10 | |
| Holmfjord | Finnmark, Norway | 2 | 2 | 0 | 2012-10-02 | |
| Holtefjell | Vestfold, Norway | 94 | 2 | 0 | 1998-09-24 | |
| Horten | Vestfold, Norway | 116 | 2 | 0 | 1998-10-08 | |
| Hostadvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Hovedøya | Oslo, Norway | 13 | 2 | 0 | 1996-10-16 | |
| Hundhammeren | Trøndelag, Norway | 2 | 2 | 0 | 2019-08-26 | |
| Hundvåg | Rogaland, Norway | 59 | 2 | 0 | 1997-10-14 | |
| Hundvåg | Rogaland, Norway | 71 | 3 | 0 | 2000-12-07 | |
| Husavatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-28 | |
| Hvasser | Vestfold, Norway | 20 | 2 | 0 | 1994-11-30 | |
| Hvasser | Vestfold, Norway | 52 | 3 | 0 | 1996-10-10 | |
| Hvervenbukta | Oslo, Norway | 1 | 1 | 0 | 2015-09-10 | |
| Hytteområde i Austefjorden | Vestland, Norway | 3 | 2 | 1 | 2007-08-31 | |
| Håkonshella | Vestland, Norway | 92 | 11 | 50 | 2018-10-01 | |
| håkonshella | Vestland, Norway | 3 | 2 | 0 | 2019-06-13 | |
| Håkonshella | Vestland, Norway | 6 | 3 | 0 | 2020-06-11 | |
| Håkonshellapollen | Vestland, Norway | 62 | 5 | 19 | 2020-06-11 | |
| Håkvik | Nordland, Norway | 5 | 2 | 0 | 1995-09-26 | |
| Hårkollen | Vestfold, Norway | 89 | 3 | 0 | 1998-09-24 | |
| Håøya | Agder, Norway | 30 | 2 | 0 | 1994-11-04 | |
| Ilene | Vestfold, Norway | 23 | 2 | 0 | 1996-09-26 | |
| Inderøy | Nordland, Norway | 1 | 1 | 0 | 1994-11-28 | |
| Indre Lafjord | Agder, Norway | 68 | 2 | 0 | 1995-09-27 | |
| Indrehavn | Vestfold, Norway | 8 | 2 | 0 | 1993-11-29 | |
| Inndyr | Nordland, Norway | 29 | 2 | 0 | 1998-09-28 | |
| Inndyr | Nordland, Norway | 5 | 2 | 0 | 1994-11-30 | |
| Innlandet | Møre og Romsdal, Norway | 5 | 2 | 0 | 1997-10-15 | |
| Innsmøla | Møre og Romsdal, Norway | 35 | 2 | 0 | 1996-09-19 | |
| Innvik | Vestland, Norway | 40 | 2 | 0 | 1996-10-03 | |
| Jansvik | Nordland, Norway | 4 | 2 | 0 | 1994-11-29 | |
| Jarenvannet | Innlandet, Norway | 1 | 1 | 0 | 1991-08-27 | |
| Jerkholmen | Agder, Norway | 19 | 2 | 0 | 1996-09-19 | |
| Jomfruland | Telemark, Norway | 2 | 2 | 0 | 1995-09-07 | |
| Judaberg | Rogaland, Norway | 17 | 2 | 0 | 1994-12-20 | |
| Justøya | Agder, Norway | 8 | 2 | 0 | 1996-10-11 |
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