Infobox UK District
name = Borough of Allerdale

status = Borough
region = North West England
admincounty = Cumbria
area = Ranked 13th
1,257.79 km²
adminhq = Workington
onscode = 16UB
population = Ranked English district rank|ONS=16UB
English district population|ONS=16UB
English district density|ONS=16UB / km²
ethnicity = 99.4% White
politics =
Allerdale Borough Council
leadership = Leader & Cabinet
executive = English district control|ONS=16UB
mp = Tony Cunningham, David Maclean
year = 2005

Allerdale is a local government district with borough status, in Cumbria, England. It is historically part of the English county of Cumberland. Its council is based in Workington and the borough has a population of 93,492 according to the 2001 census.

The District of Allerdale was formed under the Local Government Act 1972, on 1 April 1974 by the merger of the municipal borough of Workington, the urban districts of Maryport, Cockermouth and Keswick; and the rural districts of Cockermouth and Wigton. In 1995 Allerdale was granted borough status.

The name derives from the ancient region of Allerdale, represented latterly by the two wards of Cumberland, called Allerdale above Derwent and Allerdale below Derwent.

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