1798 in Great Britain
Events from the year 1798 in Great Britain. Incumbents
 Monarch – George III
 Prime Minister – William Pitt the Younger (Tory)
 Foreign Secretary – Lord Grenville
 Parliament – 18th

Events
 2 July – the Marine Police Force is formed on the River Thames by magistrate Patrick Colquhoun to prevent pilfering in the Port of London and West India Docks; it is the first organised police force in Britain. 1 August – French Revolutionary Wars: Admiral Nelson's fleet destroys the French fleet at the Battle of the Nile. 10 September – Battle of St. George's Caye: British settlers win a victory over Spanish settlers in what is to become the colony of British Honduras. 18 September – Lyrical Ballads, with a Few Other Poems by William Wordsworth and Samuel Taylor Coleridge is first published anonymously in Bristol, marking the beginning of English literary Romanticism. Most of the poems are by Wordsworth, including Lines composed a few miles above Tintern Abbey on revisiting the banks of the Wye during a tour, 13 July 1798, but also including the first publication of Coleridge's The Rime of the Ancyent Marinere. First London publication is on 4 October. 11 October – Elizabeth Inchbald's play Lovers' Vows, adapted from Kotzebue's Das Kind der Liebe, is first performed at London's Theatre Royal, Drury Lane. 4 December –  British Prime Minister William Pitt the Younger announces the introduction of income tax in 1799. Undated
 Newspaper Publication Act 1798 restricts newspaper circulation. Nathan Mayer Rothschild moves from Frankfurt in the Holy Roman Empire to England, settling up in business as a textile trader and financier in Manchester. The first recorded excavations at Stonehenge – among the first serious work in archaeology anywhere – are made by William Cunnington and Sir Richard Colt Hoare. Ongoing
 Anglo-Spanish War, 1796–1808
 French Revolutionary Wars

