Bure Marshes National Nature Reserve (NNR) is maintained by English Nature in Norfolk, England, within The Broads National Park.

It is mostly fen land and includes four Broads which are disused peat workings dug between 900 and 1350:

This area of unreclaimed marshland supports many plants and animals, including rarities such as the crested buckler fern, rare moths and spiders, and some of Britain's rarest aquatic insects.

In open fens, reed, sedge and marsh hay are still harvested, mainly for the thatching industry.