The Sirène-class submarines were a sub-class of the 600 Series built for the French Navy prior to World War II. There were four vessels in the class, built to a Loire-Simonot design. They were ordered in 1925 and completed by 1927. The four boats of the Sirène class saw action during the Second World War, from September 1939 until the  French armistice in June 1940.