The Lascelles Slavery Archive was a collaborative project between the Borthwick Institute for Archives and Harewood House Trust to conserve, preserve and make available records relating to slavery from the archives of the Lascelles family of Harewood House, Yorkshire. The project deals with a new discovery of papers relating to the family's fortune based on its estates in the West Indies. Key documents providing evidence for the acquisition of the family's wealth, once thought lost, were found in poor condition during an inventory of Harewood House. The Lascelles Slavery Archive is available through the Borthwick's searchrooms as an online resource, and represents an important section of the larger archive of the Lascelles family held by West Yorkshire Archive Service.