The Chilean Civil War of 1891 (also known as Revolution of 1891) is a civil war in Chile fought between forces supporting Congress and forces supporting the President, José Manuel Balmaceda from January 16, 1891 to September 18, 1891.

The war sees a confrontation between the Chilean Army and the Chilean Navy, which sides with the president and the congress, respectively.

This conflict ends with the defeat of the Chilean Army and the presidential forces and President Balmaceda committing suicide as a consequence.

In Chilean historiography the war marks the end of the Liberal Republic and the beginning of the Parliamentary Era.