- Apr 15 1st telephone installed: Boston-Somerville in Massachusetts
- Apr 24 Russo-Turkish War, 1877-78: Russia declares war on the Ottoman Empire.
- Sep 24 Battle of Shiroyama, decisive victory of the Imperial Japanese Army over the Satsuma Rebellion
- Nov 21 Tom Edison announces his "talking machine" invention (phonograph) - first machine to play and record sound
- Nov 29 US inventor Thomas Edison demonstrates his hand-cranked phonograph for the first time
- Dec 6 1st recording made of the human voice made by Thomas Edison reciting "Mary had a little lamb"
First ever Wimbledon tennis championship begins - first offical lawn tennis tournament - men's singles only
On July 9, 1877