This is a list of selected August 27 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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August 27: Independence Day for Moldova (1991)
- 1776 – British forces led by William Howe defeated the American Continental Army under George Washington at the Battle of Long Island in Brooklyn, New York, the largest battle of the American Revolutionary War.
- 1896 – The Anglo-Zanzibar War set the record for the shortest war in recorded history when Zanzibar surrendered less than an hour after the conflict broke out, with British forces destroying the Sultan's Palace and Harem (pictured).
- 1928 – Over sixty nations signed the Kellogg-Briand Pact, renouncing war as an instrument of national policy.
- 1957 – The Constitution of Malaysia came into force, three days before the Federation of Malaya achieved formal independence from the United Kingdom.