This is a list of selected March 14 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
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- Only four or five events are featured each day; therefore, not all important or significant events can be included.
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March 14: Laetare Sunday (Western Christianity, 2010); Mothering Sunday in the United Kingdom and Ireland; New Year's Day in the Sikh Nanakshahi calendar; White Day in Japan; Pi Day
- 1794 – American inventor Eli Whitney patented the cotton gin (pictured), the first ever machine that quickly and easily separated cotton fibers from their seedpods.
- 1915 – World War I: British forces cornered and sank the SMS Dresden, the last remnant of the German East Asia Squadron, near the Chilean island of Más a Tierra.
- 1937 – Pope Pius XI officially issued the encyclical Mit brennender Sorge, condemning antisemitism, criticizing Nazism, listing breaches of an agreement signed with the Roman Catholic Church.
- 1945 – The British Royal Air Force first used the Grand Slam, a 22,000 lb (9.98 t) earth quake bomb, on a strategic railroad viaduct in Bielefeld, Germany.
- 1991 – The "Birmingham Six", wrongly convicted of the 1974 Birmingham pub bombings in Birmingham, England, were released after sixteen years in prison.
- 1994 – Version 1.0.0 of the Linux kernel, an operating system kernel, was released, becoming one of the most prominent examples of open source software.