What countries were represented at the congress of Vienna?

France was represented by Prince Charles Maurice de Talleyrand,

England was represented by Lord Castlereagh, the Foreign Minister,

Prussia was represented by Prince Hardenberg,

Austria was represented by the Emperor of Austria.

Russia was represented by the Czar himself, Alexander I, however Count Nesselrode also attended the conference for business reasons.

There were a number of other countries, but the five main countries constituted themselves an organizing committee.