The Great storm of 1703 was a destructive extratropical cyclone that struck central and southern England on 26 November 1703. High winds caused 2,000 chimney stacks to collapse in London and damaged the New Forest, which lost 4,000 oaks. Ships were blown hundreds of miles off-course, and over 1,000 seamen died on the Goodwin Sands alone. News bulletins of casualties and damage were sold all over England – a novelty at that time. The Church of England declared that the storm was God's vengeance for the sins of the nation. Daniel Defoe thought it was a divine punishment for poor performance against Catholic armies in the War of the Spanish Succession.

Contemporary observers recorded barometric readings down to 973 millibars (measured by William Derham in south Essex), but it has been suggested that the storm deepened to 950 millibars over the Midlands.

Retrospective analysis conjectures that the storm was comparable to a Category 2 hurricane.

In London alone, approximately 2,000 massive chimney stacks were blown down. The lead roofing was blown off Westminster Abbey and Queen Anne had to shelter in a cellar at St James's Palace to avoid collapsing chimneys and part of the roof. On the Thames, some 700 ships were heaped together in the Pool of London, the section downstream from London Bridge. Huge waves on the Thames river sent water 6 feet (1.8 m) higher than had ever been recorded in London, destroying more than 5,000 homes along the river. HMS Vanguard was wrecked at Chatham. Admiral Sir Cloudesley Shovell's HMS Association was blown from Harwich to Gothenburg in Sweden before way could be made back to England. Pinnacles were blown from the top of King's College Chapel, in Cambridge.

There was extensive and prolonged flooding in the West Country, particularly around Bristol. Hundreds of people drowned in flooding on the Somerset Levels, along with thousands of sheep and cattle, and one ship was found 15 miles (24 km) inland. Approximately 400 windmills were destroyed, with the wind driving their wooden gears so fast that some burst into flames. At Wells, Bishop Richard Kidder and his wife were killed when two chimneystacks in the palace fell on them, asleep in bed. This same storm blew in part of the great west window in Wells Cathedral. Major damage occurred to the southwest tower of Llandaff Cathedral at Cardiff in Wales.

At sea, many ships were wrecked, some of which were returning from helping Archduke Charles, the claimed King of Spain, fight the French in the War of the Spanish Succession. These ships included HMS Stirling Castle, HMS Northumberland, HMS Mary and HMS Restoration, with about 1,500 seamen killed, particularly on the Goodwin Sands. At least 8,000 were said to have died overall. Some publications cite a figure between 10,000 and 30,000.^{[citation needed]} In total, around 300 Royal Navy ships anchored along the south coast were lost.

The first Eddystone Lighthouse off Plymouth was destroyed on 8 December [O.S. 27 November], killing six occupants, including its builder, Henry Winstanley. (John Rudyard was later contracted to build the second lighthouse on the site.) Two days later, a cargo ship struck the rocks and sank. She was the first wrecking to occur there since the lighthouse was constructed five years prior. Another ship, torn from its moorings in the Helford River in Cornwall, was blown for 200 miles (320 km) before grounding eight hours later on the Isle of Wight. The storm also caught a convoy of 130 merchant ships sheltering at Milford Haven, along with their man of war escorts Dolphin, Cumberland, Coventry, Looe, Hastings and Hector. By 3:00pm the next afternoon, losses included 30 vessels.

The number of oak trees lost in the New Forest alone was 4,000. The towns of Plymouth, Hull, Cowes, Portsmouth and Bristol were devastated.