Ajax was a Téméraire class 74-gun ship of the line of the French Navy.

Ajax was built at Rochefort along the lines of the Téméraire type designed by Jacques-Noël Sané, but with modifications brought by Engineers Rigault and Filhol; she is sometimes listed as a "82-gun ship".

[1] Commissioned under Captain Jean-Nicolas Petit, she replaced Jemmapes in Zacharie Allemand's squadron.

In 1808, she transferred to Toulon, where she became an artillery hulk in 1815.

This article about a specific military ship or boat of France is a stub.