Royal Botanic Gardens, Kew (brand name Kew) is a non-departmental public body in the United Kingdom sponsored by the Department for Environment, Food and Rural Affairs. An internationally important botanical research and education institution, it employs 1,100 staff. Its board of trustees is chaired by Dame Amelia Fawcett.

The organisation manages botanic gardens at Kew in Richmond upon Thames in southwest London, and at Wakehurst, a National Trust property in Sussex which is home to the internationally important Millennium Seed Bank, whose scientists work with partner organisations in more than 95 countries. Kew, jointly with the Forestry Commission, founded Bedgebury National Pinetum in Kent in 1923, specialising in growing conifers. In 1994 the Castle Howard Arboretum Trust, which runs the Yorkshire Arboretum, was formed as a partnership between Kew and the Castle Howard Estate.

In 2018 the organisation had 1,858,513 public visitors at Kew, and 354,957 at Wakehurst. Its 326-acre (132 ha) site at Kew has 40 historically important buildings; it became a UNESCO World Heritage Site on 3 July 2003. The collections at Kew and Wakehurst include over 27,000 taxa of living plants, 8.3 million plant and fungal herbarium specimens, and over 40,000 species in the seed bank.