Paul Copin-Albancelli (1851–1939, real name Paul-Joseph Copin) was a French journalist, nationalist and conspiracy author.
A former boulangiste and Freemason, Copin-Albancelli used his experience to become one of the most vehement detractors of Freemasonry, which he, along with many anti-Dreyfusards of the time, associated with Jewish conspiracies.
At the turn of the 20th century he founded the anti-Masonic and antisemitic newspapers À bas les tyrans (Down with tyrants) (with André Baron (Louis Dasté), and La Bastille.
In parallel with these activities, Copin-Albancelli was also working with the Revue Internationale des Sociétés Secrètes (International Review of Secret Societies) of bishop Ernest Jouin, the famous detractor of freemasonry and whistleblower against alleged conspiracies linked to secret powers, he was also a member of the Movement for the Defense of national traditions (or Entente nationale), regrouping several royalists of the Action Française or independents.
In his belief that various secret organizations were trying to establish a "globalist power", Copin-Albancelli exploited a myth found in the same period in the Protocol of the Elders of Zion.