James St Clair-Erskine, 2nd Earl of Rosslyn, (6 February 1762 – 18 January 1837), known as Sir James Erskine, Bt, between 1765 and 1789 and as Sir James St Clair-Erskine, Bt, between 1789 and 1805, was a Scottish soldier, politician, and Acting Grand Master of the Grand Lodge of Scotland, on behalf of King George IV.