Treaty of Campo Formio is signed between France and Austria, ending the War of the First Coalition.

The Treaty of Campo Formio was signed on 17 October 1797 by Napoleon Bonaparte and Count Philipp von Cobenzl as representatives of the French Republic and the Austrian monarchy, respectively. The treaty followed the armistice of Leoben, which had been forced on the Habsburgs by Napoleon's victorious campaign in Italy. It ended the War of the First Coalition and left Great Britain fighting alone against revolutionary France.

The War of the First Coalition was a set of wars that several European powers fought between 1792 and 1797, against France. They were only loosely allied and fought without much apparent coordination or agreement; each power had its eye on a different part of France it wanted to appropriate after a French defeat, which never occurred.

October 17 is the 290th day of the year in the Gregorian calendar; 75 days remain until the end of the year.