Baron Waterpark of Waterpark in the County of Cork, is a title in the Peerage of Ireland. It was created in 1792 for Sarah, Lady Cavendish, in honour of her husband, Sir Henry Cavendish, 2nd Baronet. Sir Henry Cavendish was a politician who represented Lismore and Killybegs in the Irish House of Commons and served as Vice-Treasurer of Ireland and as Receiver-General of Ireland. From 1768 to 1774 he sat in the British House of Commons for Lostwithiel.

The Peerage of Ireland consists of those titles of nobility created by the English monarchs in their capacity as Lord or King of Ireland, or later by monarchs of the United Kingdom of Great Britain and Ireland. It is one of the five divisions of Peerages in the United Kingdom. The creation of such titles came to an end in the 19th century. The ranks of the Irish peerage are duke, marquess, earl, viscount and baron. As of 2016, there were 135 titles in the Peerage of Ireland extant: two dukedoms, ten marquessates, 43 earldoms, 28 viscountcies, and 52 baronies. However, these titles have no official recognition in the Republic of Ireland, with Article 40.2 of the Constitution of Ireland forbidding the state conferring titles of nobility and stating that an Irish citizen may not accept titles of nobility or honour except with the prior approval of the Irish government.