The Charter of 1815, signed on 22 April 1815, was the French constitution prepared by Benjamin Constant at the request of Napoleon I when he returned from exile on Elba.

The Additional Act reframed the Napoleonic constitution into something more along the lines of the Bourbon Restoration's Charter of 1814 of Louis XVIII, while otherwise ignoring the Bourbon charter's existence.

Napoleon, having returned from the Island of Elba for the Hundred Days, was not able to re-establish the First Empire as it had been before his restoration.

The legislative power was to be exercised by the Emperor together with the Parliament, which was to be composed of two chambers: the Chamber of Peers composed of hereditary members appointed by the Emperor, and the Chamber of Representatives, composed of 629 citizens elected for 5 year terms by electoral colleges in the individual departments.

In the end, the two chambers held sessions for only one month, from June 3 to July 7, 1815.