| Knappskog | Vestland, Norway | 5 | 2 | 0 | 2010-09-27 | |
| Knappskog skule | Vestland, Norway | 1 | 1 | 0 | 2007-10-10 | |
| Kolbotnvannet | Akershus, Norway | 1 | 1 | 0 | 2000-05-26 | |
| Kongsmarka | Nordland, Norway | 1 | 1 | 0 | 2013-09-23 | |
| Korsvika | Trøndelag, Norway | 2 | 2 | 2 | 2013-06-07 | |
| Kristianborgvannet | Vestland, Norway | 1 | 1 | 0 | 2006-05-11 | |
| Krossleitet | Vestland, Norway | 1 | 1 | 0 | 2023-06-03 | |
| Krussætertjern | Østfold, Norway | 3 | 2 | 0 | 2000-09-08 | |
| Kråa | Troms, Norway | 1 | 1 | 0 | 2013-09-19 | |
| Kråkstad | Akershus, Norway | 1 | 1 | 0 | 2013-08-29 | |
| Kvasselvbakken | Rogaland, Norway | 1 | 1 | 0 | 2016-05-20 | |
| Kvassnesstemma | Vestland, Norway | 2 | 2 | 0 | 2001-09-17 | |
| Kvernavatnet | Vestland, Norway | 5 | 3 | 0 | 2010-09-20 | |
| Kvernhussveen | Innlandet, Norway | 1 | 1 | 0 | 2013-09-18 | |
| Kvidavigjå | Rogaland, Norway | 2 | 2 | 3 | 2009-04-10 | |
| Kyvatnet | Trøndelag, Norway | 2 | 1 | 0 | 2011-09-15 | |
| Kyvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2003-08-26 | |
| Laglim | Innlandet, Norway | 3 | 2 | 0 | 2013-06-10 | |
| Lakselv | Finnmark, Norway | 1 | 1 | 1 | 2013-10-20 | |
| Lammetjønna | Vestland, Norway | 1 | 1 | 0 | 2001-09-25 | |
| Landåsbekken | Vestland, Norway | 1 | 1 | 0 | 2004-08-31 | |
| Langevann | Vestland, Norway | 1 | 1 | 0 | 2006-05-23 | |
| Langvannet | Akershus, Norway | 1 | 1 | 0 | 2002-05-23 | |
| Langvannet | Akershus, Norway | 1 | 1 | 0 | 2002-05-23 | |
| Langvatnet, Tromsøya | Troms, Norway | 1 | 1 | 0 | 2014-09-02 | |
| Lappland | Innlandet, Norway | 1 | 1 | 0 | 2011-04-20 | |
| Lappland | Innlandet, Norway | 2 | 1 | 2 | 2020-09-01 | |
| Lavvodammen | Troms, Norway | 2 | 2 | 0 | 2013-09-20 | |
| Lianvatnet | Trøndelag, Norway | 4 | 2 | 0 | 2008-09-10 | |
| Liavannet | Vestland, Norway | 1 | 1 | 0 | 2015-06-25 | |
| Lille Haukdalsvatn | Finnmark, Norway | 12 | 2 | 0 | 2011-09-05 | |
| Lille Lungegårdsvann | Vestland, Norway | 1 | 1 | 0 | 2005-08-30 | |
| Lillestrøm ved Nittelva | Akershus, Norway | 2 | 1 | 0 | 2013-09-13 | |
| Lilleåna, Haihølen | Agder, Norway | 1 | 1 | 0 | 2013-06-10 | |
| Lisjeelva | Møre og Romsdal, Norway | 4 | 2 | 0 | 2003-09-12 | |
| Lisleby | Østfold, Norway | 1 | 1 | 0 | 2017-09-05 | |
| Lissbjørknesset | Trøndelag, Norway | 11 | 3 | 0 | 2016-09-12 | |
| Lisselva | Trøndelag, Norway | 3 | 3 | 0 | 1999-09-13 | |
| Litjvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Litjvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-09-14 | |
| Litlegjerde | Møre og Romsdal, Norway | 2 | 2 | 0 | 2002-06-04 | |
| Litlvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1996-09-06 | |
| Ljøbrekka | Møre og Romsdal, Norway | 1 | 1 | 0 | 2023-09-08 | |
| lokalmiljø | Finnmark, Norway | 4 | 2 | 0 | 2009-09-02 | |
| Lomtjern | Østfold, Norway | 1 | 1 | 0 | 2017-05-04 | |
| Lone | Vestland, Norway | 1 | 1 | 0 | 2015-05-18 | |
| Losby besøksgård | Akershus, Norway | 5 | 2 | 0 | 2009-06-23 | |
| Lutvann - badeplass i nordre ende | Oslo, Norway | 1 | 1 | 0 | 2013-06-20 | |
| Lynghei/Myr nedanfor Vassivarhøyen | Vestland, Norway | 1 | 1 | 0 | 2006-08-22 | |
| Lønsetbakken | Møre og Romsdal, Norway | 1 | 1 | 0 | 2011-04-19 | |
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