The 1876–77 Constantinople Conference (Turkish: Tersane Konferansı "Shipyard Conference", after the venue Tersane Sarayı "Shipyard Palace") of the Great Powers (Austria-Hungary, Britain, France, Germany, Italy and Russia) was held in Constantinople (now Istanbul) from 23 December 1876 until 20 January 1877. Following the beginning of the Herzegovinian Uprising in 1875 and the April Uprising in April 1876, the Great Powers agreed on a project for political reforms in Bosnia and in the Ottoman territories with a majority-Bulgarian population. The Ottoman Empire refused the proposed reforms, leading to the Russo-Turkish War a few months later.

1877Jan, 20
The last day of the Constantinople Conference results in agreement for political reforms in the Balkans.
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Events on 1877
- 20Feb
Swan Lake
Tchaikovsky's ballet Swan Lake receives its premiere at the Bolshoi Theatre in Moscow. - 10May
Mihail Kogălniceanu
Romania declares itself independent from the Ottoman Empire following the Senate adoption of Mihail Kogălniceanu's Declaration of Independence. - 10Jul
Mayagüez, Puerto Rico
The then-villa of Mayagüez, Puerto Rico, formally receives its city charter from the Royal Crown of Spain. - 5Oct
Nez Perce people
Chief Joseph surrenders his Nez Perce band to General Nelson A. Miles. - 21Nov
Phonograph
Thomas Edison announces his invention of the phonograph, a machine that can record and play sound.