James St Clair-Erskine, 5th Earl of Rosslyn

Earldom of Rosslyn
Quarterly, 1st Argent, a cross engrailed Sable (St Clair); 2nd Argent, a pale Sable (Erskine); 3rd Azure, a bend between six cross crosslets fitchée Or (Mar); 4th Argent, on a chevron between three roses Gules a fleur-de-lys of the field for difference (Wedderburn).
Creation date	21 April 1801
Monarch	King George III
Peerage	Peerage of the United Kingdom
First holder	Alexander Wedderburn, 1st Baron Loughborough
Present holder	Peter St Clair-Erskine, 7th Earl of Rosslyn
Heir apparent	Jamie St Clair-Erskine, Lord Loughborough
Remainder to	heirs male whatsoever
Subsidiary titles	Baron Loughborough Baronet of Alva

Earl of Rosslyn is a title in the Peerage of the United Kingdom. It was created in 1801 for Alexander Wedderburn, 1st Baron Loughborough, Lord Chancellor from 1793 to 1801, with special remainder to his nephew Sir James St Clair-Erskine, as Wedderburn had no surviving issue of his own. Wedderburn had already been created Baron Loughborough, of Loughborough in the County of Leicester, in the Peerage of Great Britain in 1780, with normal remainder to the heirs male of his body, and Baron Loughborough, of Loughborough in the County of Surrey, in the Peerage of Great Britain in 1795, with the same remainder as the earldom. The 1780 barony became extinct upon his death, but the 1795 barony and the earldom passed, by the special remainder, to his nephew, who thus became the second Earl of Rosslyn. The second Earl was a Lieutenant-General in the Army and also held political office as Lord Privy Seal and Lord President of the Council.

His son, the third Earl, was a General in the Army and held political office as Master of the Buckhounds and Under-Secretary of State for War. He was succeeded by his son, the fourth Earl. He served as Captain of the Honourable Corps of Gentlemen-at-Arms (Chief Government Whip in the House of Lords) in Lord Salisbury's second Conservative administration.

As of 2015^[update], the titles are held by his great-great-grandson, the seventh Earl, who succeeded his father in 1977. He is a former police officer with the Metropolitan Police Service. Lord Rosslyn is also one of the ninety elected hereditary peers that remain in the House of Lords after the passing of the House of Lords Act 1999, and sits as a cross-bencher.