An Abbreviator (plural "Abbreviators" in English and "Abbreviatores" in Latin) or Breviator was a writer of the Papal Chancery who adumbrated and prepared in correct form Papal bulls, briefs, and consistorial decrees before these were written out in extenso by the scriptores.

They are first mentioned in the Papal bull Extravagantes of Pope John XXII and in a Papal bull of Pope Benedict XII.

After the protonotaries left the adumbration of the minutes to the Abbreviators, those de Parco majori of the dignity of prelate were the most important officers of the Papal Chancery. By the pontificate of Pope Martin V their signature was essential to the validity of the acts of the Chancery. Over time they obtained many important privileges.