Biodiversity
- Natural History Museum
- Royal Society for the Protection of Birds
- The Vincent Wildlife Trust
- Woodland of Ireland
- Biology.ie – Nature’s Calendar
- Notice Nature
- Butterfly Conservation
- Crann
- Groundwork
- Native Woodland Trust
- Irish Whale and Dolphin Group
- Friends of the Irish Environment
- Sustainable Ireland
- Irish Seal Sanctuary
- Bat Conservation Ireland
- Badger Watch Ireland
- Hedgerow Management
- Hedgelaying Association of Ireland
- Endangered Species (International)
- The International Convention of the Conservation of Nature (IUCN)
- Convention on Biological Diversity
- The Ramsar Convention on Wetlands
- The European Forum on Nature Conservation and Pastoralism
- Earthwatch Institute (Europe Section)
- Lichens of Ireland Project
- The Golden Eagle Trust
- National Parks and Wildlife Service
- Birdwatch Ireland
- Irish Brent Goose Research Group
- Geological Survey of Ireland
- Inland Waterways Association of Ireland
- Waterways Ireland
- Irish Peatland Conservation Council
- Irish Wildlife Trust
- An Taisce - The National Trust for Ireland
- Inland Fisheries Ireland
- Biodiversity Ireland
- Tree Council of Ireland
- Wild About Gardens
- Irish Seedsavers Association
- A selection of the winners from a Natural Heritage photography competition held in May 2007 by the Heritage Office in partnership with the OPW and Meath Tourism - Flickr slideshow
- Invasive Species of Ireland