The Bayard was a 90-gun Ship of the line of the French Navy. She was the first ship in French service named in honour of Pierre Terrail, seigneur de Bayard.
Bayard took part in the Crimean War in the Black Sea in 1854 and 1855, notably taking part in the Siege of Sevastopol by shelling the city on 17 October 1854. She suffered serious damage in the storm of 14 November, and returned to France to be place in ordinary.
In 1858, she was transformed into a steam and sail ship in Cherbourg, carrying out her first engine trials in 1860. The next year, she again suffered severe damage in a storm in the Strait of Magellan.
In 1866, she was used as a troopship to return the expeditionary corps back to France after the French intervention in Mexico. From 1871, she was used as a prison hulk in Cherbourg for prisoners from the Paris Commune. Struck on 20 June 1872, she was renamed Triton and eventually broken up in 1879.