Captain Robin Rathmore Plunket, 8th Baron Plunket (3 December 1925 – 16 November 2013), was a descendant of prominent Irish lawyer and Whig politician William Conyngham Plunket for whom the Peerage of the United Kingdom (not of Ireland) was created in 1827.
Plunket was christened on 1 February 1926 at St Saviour's Church, Walton Street, London.
His godmother was his parents' friend, the Duchess of York (later Queen Elizabeth the Queen Mother), who was represented on this occasion by Mabell Ogilvy, Countess of Airlie.
Lord and Lady Plunket were killed in an aircraft crash in 1938, and their three sons (Robin Rathmore Plunket, Patrick Terence William Span Plunket, and Shaun Albert Frederick Sheridan Plunket) were brought up by their father's sister, the Hon.