"Black Monday" may refer to:

• Black Monday, Dublin, 1209 – when a group of 500 recently arrived settlers from Bristol were massacred by warriors of the Gaelic O'Byrne clan. The group had left the safety of the walled city of Dublin to celebrate Easter Monday near a wood at Ranelagh, when they were attacked without warning. For centuries afterwards, this event was commemorated by a mustering of soldiers on the day as a challenge to the native tribes.
• Black Monday, 14 April 1360 – the army of Edward III during the Hundred Years' War was struck by hailstorms, lightning and panic, causing considerable loss of life on Easter Monday.
• Black Monday, 27 February 1865 – a "sirocco" wind brought sandstorms to Melbourne, Australia affecting Sandhurst and Castlemaine.
• Black Monday, 8 February 1886 – when a major protest over unemployment led to a riot in Pall Mall, London.
• Black Monday, December 10 1894 – when both banks of Newfoundland, Britain?s oldest colony, had closed their doors, thus rendering that colony?s main medium of exchange worthless.
• Black Monday, 28 October 1929 – a day in the Wall Street Crash of 1929, which also saw major stock market upheaval.
• Black Monday, 27 May 1935 – US Supreme Court Justices overturned multiple Acts including National Industrial Recovery Act.
• Black Monday, September 19, 1977 – when Youngstown Sheet and Tube Company, one of America's largest regional steel-manufacturing firms, announced that it would shut down most of its operations in the vicinity of Youngstown, Ohio. This development presaged the collapse of that community's industrial economy.
• Black Monday, Malta, 15 October 1979 – the offices of the The Times of Malta were set on fire during a political rally. It was also on this day that supporters of the Malta Labour Party broke into the house of Dr. Edward Fenech Adami.
• Black Monday, 19 October 1987 – the second largest one-day decline in recorded stock market history.

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