Robert Banks Jenkinson, 2nd Earl of Liverpool KG PC (7 June 1770 – 4 December 1828) is a British politician and the longest-serving Prime Minister of the United Kingdom since the Union with Ireland in 1801.

He is 42 years old when he becomes premier in 1812, which makes him younger than all of his successors to date.

During his time as Prime Minister from 1812 to 1827, Liverpool becomes known for repressive measures introduced to maintain order, but also for steering the country through the period of radicalism and unrest that follows the Napoleonic Wars.

Important events during his tenure as Prime Minister include the War of 1812, the Sixth and Seventh Coalitions against the French Empire, the conclusion of the Napoleonic Wars at the Congress of Vienna, the Corn Laws, the Peterloo Massacre, the Trinitarian Act 1812 and the emerging issue of Catholic Emancipation.