- Environment Agency http://www.environment-agency.gov.uk/ National Government agency dealing with, amongst other things, water management, flood defence, and pollution issues.
- Hampshire Wildlife Trust http://www.hwt.org.uk County wildlife charity with several open access nature reserves on the Downs
- Natural England http://www.naturalengland.org.uk Government Agency responsible for countryside matters, including overall responsibility for National Trails.
- RSPB http://www.rspb.org.uk National conservation organisation with a major nature reserve at Pulborough Brooks
- Sussex Wildlife Trust http://www.sussexwt.org.uk County wildlife charity with several open access nature reserves on the Downs
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