Mjällby is a locality situated in Sölvesborg Municipality, Blekinge County, Sweden with 1,254 inhabitants in 2010.

Fur farming is currently under heavy political debate in Sweden.

A suburb of the town built by a local housing company was unofficially known for around 40 years by locals as Negerby (Negro village) because of the black chimneys on the houses.

In 2012 the use of this name was reported by a journalist and following the public outcry the housing company decided to use the temporary name of Slottsstaden (Castle City).

This article about a location in Blekinge County, Sweden is a stub.