Pierre Sidos (born 6 January 1927 in Saint-Pierre-d'Oléron) was a French far right political figure, mainly active in the post-war era. He achieved his widest prominence as leader of Jeune Nation although he walso involved in several other movements.
Sidos' father, Francois, was active in the collaborationist Milice and he was executed on 28 March 1946 for his involvement. Pierre Sidos was interned after the war and was not released until 1949.
Sidos continued his father's political beliefs and became founder of the Jeune Nation after the Second World War, along with his brothers François and Jacques. In order to underline the credentials of the new movement Sidos chose the Celtic Cross as its emblem in honour of the Charlemagne SS Waffen Division. He also took a role in Jacques Isorni's Union des nationaux indépendants et républicains, presenting as a candidate for them in the 1951 election in Indre with a manifesto calling for the criminalisation of communism and more power to the President and Senate. Sidos was especially active during the Algerian War of Independence and was a member of the Organisation armée secrète, although his role in this group was fairly minor.
Jeune Nation was banned in 1958 (although the journal of the same name, which Sidos established in June 1958, continued to publish) and Sidos initially tried to revive it the following year as the Parti Nationaliste but this group was also outlawed after it was involved in a series of civil disturbances. Sidos went into hiding but was captured in 1962 and subsequently convicted of conspiracy to overthrow the constitutional regime and of involvement in a banned organisation.