Robert St Clair-Erskine 4th Earl of Rosslyn
 Robert Francis St Clair-Erskine 4th Earl of Rosslyn (2 March 1833 – 6 September 1890) styled Lord Loughborough until 1866 was a Scottish Conservative politician. He served as Captain of the Gentlemen-at-Arms under Lord Salisbury between 1886 and 1890.