St Leonards-on-Sea Congregational Church is a former Congregational church in St Leonards-on-Sea, part of the town and borough of Hastings in East Sussex, England. Considered "one of the most ambitious Nonconformist buildings in Sussex", the sandstone building of 1863 forms a significant landmark on one of the Victorian resort's main roads—despite the loss of its copper spire in the Great Storm of 1987. Unlike most churches of its denomination, it did not join the United Reformed Church when that denomination was formed in 1972. It fell out of religious use in 2008 and had stood empty and was at risk of demolition. English Heritage has listed the building at Grade II for its architectural and historical importance.