The Wood Pit disaster was a mining accident on 7 June 1878, when an underground gas explosion occurred at the Wood Pit, in Haydock, then in the historic county of Lancashire, in North West England. The official death toll was 189 although contemporary reports at first stated that over 200 had been killed.

Haydock is a village within the Metropolitan Borough of St Helens, in Merseyside, England. At the 2011 Census, it had a population of 11,416 Haydock's historic area covers the Haydock electoral ward and a section of the Blackbrook ward.