The Historical Archive of the City of Cologne (German: Historisches Archiv der Stadt Köln, or Kölner Stadtarchiv for short) is the municipal archive of Cologne, Germany. It ranks among the largest communal archives in Europe.
A municipal archive has existed in Cologne since the Middle Ages. The oldest inventory of charters in the archive is dated 1408–1409. The oldest document kept in the archive is a charter dated 922 CE.
The archive contains official records and private documents from all ages of Cologne history, as well as an extensive library of manuscripts.