Martham Broad

Martham Broad
Location	The Norfolk Broads Norfolk
Coordinates	52°43′27″N 1°38′27″E / 52.72417°N 1.64083°E / 52.72417; 1.64083Coordinates: 52°43′27″N 1°38′27″E / 52.72417°N 1.64083°E / 52.72417; 1.64083
Primary inflows	River Thurne
Primary outflows	River Thurne
Basin countries	United Kingdom
Surface area	59 ha

Martham Broad is a broad (or lake) and National Nature Reserve on the River Thurne in the English county of Norfolk. The broad is located within The Broads National Park about 2 km north of the village of Martham.

The nature reserve is maintained by English Nature and is part of the Upper Thurne Broads and Marshes SSSI (Site of Special Scientific Interest). It is owned and managed by Norfolk Wildlife Trust. It comprises 590,000 m² of open water, reed and saw-sedge fen, and it is a shallow, brackish lake. The reed swamp consists of common reed and lesser reedmace. In summer, the swallowtail butterfly can be seen.

Boats can only use a narrow marked channel through the broad; they are discouraged from using the broad during the winter months because of the breeding season. There is a footpath through the reserve. The path along the north side of the Broad presents one of the best views in Norfolk across the Broad.