Marquess of Rockingham, in the County of Northampton, was a title in the Peerage of Great Britain.

In 1714 he was created Baron Throwley, Viscount Sondes and Earl of Rockingham in the Peerage of Great Britain.

He was succeeded in the baronetcy and barony of Rockingham by his first cousin once removed, Thomas Watson-Wentworth, 1st Earl of Malton, who became the sixth Baron.

Lord Rockingham was a prominent Whig grandee and served as Prime Minister of Great Britain between 1765 and 1766 and again in 1782.

The family seats were Rockingham Castle, Northamptonshire, and Wentworth Woodhouse, near Rotherham, Yorkshire.