|1940 in the United Kingdom|
|1938 | 1939 | 1940 | 1941 | 1942|
|Constituent countries of the United Kingdom|
|Northern Ireland | Scotland | Wales|
Events from the year 1940 in the United Kingdom. The year was dominated by Britain's involvement in the Second World War, which commenced in September the previous year, as well as the numerous enemy air raids on Britain and thousands of subsequent casualties. Although the war continued, Britain did triumph in the Battle of Britain and Nazi Germany's invasion attempt did not take place.