In eminenti apostolatus specula is a papal bull issued by Pope Clement XII on 28 April 1738, banning Catholics from becoming Freemasons.
In 1737 he learned that Hanoverian Freemasons had recruited so many French Catholics that they had taken control of the Grande Loge de France from the Jacobites.
He asked Clement XII to issue a papal bull condemning Hanoverian Freemasonry in the Catholic countries of Europe.
Jacobite sympathizers in France had formed a secret lodge of Freemasons; their attempts to influence Fleury to support the Stuart faction led instead to raids on their premises, and Fleury urged Pope Clement XII to issue a bull that forbade all Roman Catholics to become Freemasons under threat of excommunication.
He noted that membership of Masonic Lodges, "spreading far and wide and daily growing in strength", was open to men of any religion or sect, who were sworn to secrecy.