Hertfordshire wildlife organisations and groups
- Herts Bird Club
- Herts Moth Group
- Butterfly Conservation, Herts and Middlesex Branch
- British Naturalists' Association (Hertfordshire Branch)
- Cheshunt Natural History Society
- Herts Amphibian & Reptile Group (Herts ARG)
- Hertfordshire and Bedfordshire Fungi Group
- Herts & Middx Bat Group
- Herts & Middlesex Wildlife Trust
- Hertfordshire Biological Records Centre
- Hertfordshire Countryside Management Service
- Letchworth Naturalists Society
- RSPB Local Groups, there are 15 in Hertfordshire
- RSPB Hitchin & Letchworth Group
- RSPB St Albans Group
- RSPB Watford Group
- Rye Meads Ringing Group
- Sherrardspark Wood Wardens Welwyn Garden City
- St Albans Watercress Wildlife Association
- Watford Coleoptera Group (Beetles)
- Welwyn Natural History Society
- Friends of Tring Reservoir
- Great Groves in Broxbourne Woods
- Hertfordshire Orchard Initiative
- Marshalls Heath Nature Reserve
- Stort Valley Wild
- Friends of Tyttenhanger G.P.
County natural history societies
National organisations
- Bat Conservation Trust
- Bees, Wasps and Ants Recording Society
- Botanical Society of the British Isles
- British Entomological and Natural History Society
- British Trust for Ornithology
- Butterfly Conservation
- Defra Department for Environment, Food and Rural Affairs
- Field Studies Council
- Hoverfly Recording Scheme
- Mammal Society
- National Biodiversity Network
- National Federation of Badger Groups
- National Federation for Biological Recording
- Natural England
- Pond Conservation
- Royal Entomological Society
- Royal Society for the Protection of Birds
- National Trust (nature pages)
- UK Ladybird Society
- UK Phenology Network
- Wildfowl & Wetlands Trust
- Wildlife Trusts Partnership
- Woodland Trust