May 13, 1927 (Friday)
- The equity market in Germany suffered a severe price drop after Reichsbank President Hjalmar Schacht had attempted to stop price speculation. Prices continued to decline following the "Black Friday".
- King George V issued a royal proclamation dropping the term "United Kingdom" from his title, referring to himself instead as "Georgius V, Dei Gratia Magane Britanniae, Hiberniae et terrarum transmarinarum quae in ditione iunt Britannica Rex, Fidei Defensor, Indiae Imperator" ("George V, by the Grace of God, of Great Britain, Ireland, and the British Dominions beyond the Seas, King, Defender of the Faith, Emperor of India").
- Born: Herbert Ross, American film director, (d. 2001) and Fred Hellerman, American songwriter, both in Brooklyn.
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