The UK Centre for Ecology & Hydrology (UKCEH) is a centre for excellence in environmental science across water, land and air. The organisation has a long history of investigating, monitoring and modelling environmental change, and its science makes a difference in the world. The issues that its science addresses include: air pollution, biodiversity, chemical risks in the environment, extreme weather events, droughts, floods, greenhouse gas emissions, soil health, sustainable agriculture, sustainable ecosystems, water quality, and water resources management.

UKCEH coordinates a number of long-term environmental science monitoring sites and programmes, including the Predatory Bird Monitoring Scheme, the Isle of May Long-Term Study, the UK National River Flow Archive, the Plynlimon catchment study, lakes monitoring at Loch Leven and in the English Lake District, the UK Cosmic-ray soil moisture monitoring network (COSMOS-UK), the UK Upland Waters Monitoring Network and the UKCEH Countryside Survey.

UKCEH is a strategic delivery partner for the Natural Environment Research Council (NERC), part of UK Research and Innovation (UKRI).The institute has four locations: Wallingford (its headquarters), Edinburgh, Lancaster and Bangor.

UKCEH is a member of the Partnership for European Environmental Research (PEER).