Wikipedia:Selected anniversaries/July 27
- 1214 - Battle of Bouvines: In France, Philip II of France defeated John of England.
- 1549 - Jesuit priest Francis Xavier's ship arrived in Kagoshima, Japan.
- 1865 - A group of 153 Welsh settlers arrived at Chubut Valley in Argentina's Patagonia region.
- 1921 - University of Toronto researchers led by Frederick Banting announced the discovery of the hormone insulin.
- 1940 - Bugs Bunny debuted in the animated cartoon A Wild Hare.
- 1996 - Centennial Olympic Park bombing: A pipe bomb exploded during the 1996 Summer Olympics in Atlanta, Georgia, United States, killing two and injuring 111.