The Holmfirth floods refers to a number of instances when severe flooding had occurred in the Holme Valley, West Yorkshire, England affecting Holmfirth and other settlements in the valley. The earliest record dates from 1738 and the latest from 1944. The most severe flood occurred early on the morning of 5 February 1852, when the embankment of the Bilberry reservoir collapsed causing the deaths of 81 people. It is recorded as the 23rd most serious, worldwide, in terms of loss of life from floods and landslides in human history.