The London Borough of Hackney is a London borough in Inner London, England. The historical and administrative heart of Hackney is Mare Street, which lies 5 miles (8 km) north-east of Charing Cross. The borough is named after Hackney, its principal district. Southern and eastern parts of the borough are popularly regarded as being part of east London that spans some of the traditional East End of London with the northwest belonging to north London. Its population is estimated to be 281,120.

Mare Street is a street in the London Borough of Hackney. It has existed since the 15th century, when it was one of the first roads at the centre of the parish. It was then known as Merestret. The word mere was either the Old English mǣre meaning a boundary — referring to the boundary with the parish of Stepney — or mere, a large pond which was fed by Hackney Brook.