The Holy Alliance (also called the Grand Alliance) is a fourth coalition of Russia, Austria and Prussia created in 1815 at the behest of Czar Alexander I of Russia, signed by the three powers in Paris on September 26, 1815, in the Congress of Vienna after the defeat of Napoleon.

Ostensibly it is to instill the Christian values of charity and peace in European political life, but in practice Klemens Wenzel von Metternich makes it a bastion against revolution.

The monarchs of the three countries involved use this to band together in order to prevent revolutionary influence (especially from the French Revolution) from entering these nations.

It is against democracy, revolution, and secularism.

The Alliance is usually associated with the Quadruple and Quintuple Alliances, which include the United Kingdom and (from 1818) France with the aim of upholding the European peace settlement concluded at the Congress of Vienna.

The Alliance is conventionally taken to have become defunct with Alexander's death in 1825.